Explenations

1-Author's Note on the Gods in the World of Ice and Fire from my POV:

One of the interesting facets of religion in George R.R. Martin's A Song of Ice and Fire series is the ambiguous and largely ineffectual nature of the various gods worshipped in Westeros and Essos.

Having consumed countless fantasy works where divine entities directly intervene in mortal affairs or clearly manifest their power, the gods in ASOIAF stand apart due to their notable absence of influence over worldly events. With some exceptions, they give no prophesies or omens, and never appear to or communicate with believers.

The cause of this seems to be that whatever divine essence or supernatural ability the gods possessed thousands of years ago once possessed has long faded, leaving them but names with no innate strength or connection to the mortal realm. Over millennia, this severing from humanity has worsened, such that most gods now exert no discernible presence whatsoever.

The Lord of Light stands out as a rare exception, as the consistent burning of non-believers in his temples is theorized to provide some measure of sacrificial energy, keeping Rhllor's contact with mortal followers tenuous but perceptibly stronger than other faiths. Yet even he acts through devotees rather than directly intervening.

In my fanfiction continuation of A Song of Ice and Fire story, the diminished and inert state of the Westerosi gods has now progressed to the point of potential obliteration.

Cut off from sacrificial offerings, prayers, and any connection to the mortal realm for millennia, the divine essences representing the Father, Mother, Warrior, and other faiths have grown so weak that they now teeter on the brink of being fully consumed by the void of oblivion.

Sensing their rapidly fading grip on existence, the gods in their desperation have transcended their normally aloof celestial natures. In a final gambit to restore their depleted power and forestall an eternal demise, they have singled out mortal champions to act as their instrument in the material world.

The divine powers understand this is likely their last opportunity to stave off an irreversible fade into the abyss. With their connection to the mortal plane hanging by a thread, they lack the strength to manifest champions once defeated.

Each agent killed means the permanent loss of one more deity's essence, ripping another thread from the tapestry of faith. Too many failures will surely result in that essence dissipating utterly, the god joining the formless void from which no return is possible.

Any who fall in battle condemn their patron deity to an eternal death along with themselves. Survival requires vanquishing rivals endorsed by opposing faiths, eliminating adversaries who would see their gods obliterated.

It has become a do-or-die gambit for both mortal agents and divine powers alike. Success in restoring faith and worship is the sole means of sustaining existence; failure eradicates any hope of the gods' rescue. In this desperate endgame, no mercy or quarter can be given to opposing champions racing to rekindle belief before their divine patrons wink out forever in the long night.

The fate of gods and men alike now hangs by the blade of champions in mortal combat. Each blow struck against a rival is a death knell for the deity they strive to doom to the void beyond. In this twilight struggle, nothing less than total victory or annihilation awaits both sides

The more marginal faiths whose worshippers have dwindled to scarce numbers face an even steeper uphill battle. The Old Gods scarcely retain vestiges of sentience through the remaining Northmen and Crone Men who heed the ancient forests.

The Drowned God and Storm God have lost followers across the stormlands and iron islands to newer faiths. With slots of worshippers numbering in the low thousands or less, these waning deities are dangerously close to the point of no return.

They possess just enough remaining essence to potentially manifest one or two champions in the game, but success is critical. Should those first agents fall, it will likely deplete the last dregs of their power, consigning them to the darkness beyond knowing.

Larger faiths with millions still kneeling such as the Seven and Lord of Light have more margin for error. Yet even their reservoirs of divinity are not bottomless - for each champion that fails, it grows increasingly difficult to incarnate replacements as their worshippers turn faithless or follow rival gods.

All the gods understand this may be their closing moment to retake the mortal realms or fade to nothingness. But the great and small faiths alike face futures defined by the victories or failures of those champions desperately fighting to restore belief before the last embers of divinity are snuffed out forever.

2-why did the gods reach this far in my opinion:

Through examining many works of epic fantasy fiction, one could view the dynamic between divine beings and mortal realms as a tenuous balance. The gods exist in magical domains that intersect with the physical world but remain ultimately separate from it.

The world's consciousness acts as the connecting force that allows gods to access mortal worship and belief - the source of their essence and strength. If this consciousness deems the gods too disruptive to the natural order of the realm, it risks severing the connection entirely.

To maintain this boundary and their influence, the gods tread carefully. Loud displays of power risk disturbing the world consciousness and cultural order that preserves the status quo, upon which the gods depend for continued relevance and connection to humanity.

Too much interference could damage this arrangement, prompting a backlash that severs the gods' influence. Without worship and belief sustaining their essence, the divine powers face fading into a formless void. Therefore, self-interest compels discretion rather than direct control over worldly events.

Subtle nudges from the gods' domain aim to steer fate favorably rather than overtly command it. Calamities often arise from within mortal affairs rather than provocation by the gods themselves. This lets civilizations develop independently while still attributing outcomes to the divine plan.

As long as this equilibrium lasts and worldly progress fulfills spiritual needs, the gods endure symbiotically at the boundary between realms. But upsetting that balance risks expulsion from a world where their relevance is tolerated more than their right as ethereal rulers is accepted absolutely. A fragile symbiosis persists so long as neither party oversteps their bounds.

The Valyrian pantheon held a unique position amongst the gods, as their power was primarily derived from the formidable dragons rather than singular dependence on mortal worship. This allowed them greater independence and dominance over the known world through their mortal followers.

However, their growing strength eventually posed a threat to the more traditional gods who relied fully on the fickle tides of human faith. The Valyrians' mastery of dragonfire made them impervious to the normal mechanisms of maintaining order between the divine and mortal realms.

Seeing an opportunity to curb the upstart Valyrian gods' ascendance, it's possible the older pantheons conspired together in some act that triggered the cataclysm of the Doom. Destroying Valyria cut off the rebellious interlopers from their wells of power in one fell swoop.

A paradigm shift took place as the world consciousness rejected its role as host to the gods because of the loud displays of power disturbing the world consciousness and cultural order,the world now perceived the gods as parasites, the divine patrons lost legitimacy in the eyes of the realm itself.

This destabilized religious doctrine across lands where gods once dictated reverent obedience. The diminished state of worship today stems from the Valyrian tragedy prompting the world's consciousness to expel the gods from their pivotal place in cultural order, regardless of any individual mortal's beliefs.