loskro
second one I say. the story is really good and you did well to make the character non-human in his actions. Also you can make it so the world responds to his power by rapidly evolving strong creature to combat him and equal out the ecosystem so he can't just rule it make monsters like from the Godzilla monsterverse that heal the surroundings around them so the fights don't destroy the planet
I think you should actually end this story finish it off with the Mc tying off all the loose ends and finish his island project maybe make himself some offspring and then you follow the story of his offsprings journeys in duffernt universe's as the Mc completes his island and makes it its own separate dimension after becoming a deity that can create matter etc that way you don't kill off the Mc or nerf him to the point the story isn't worth writing anymore
a better solution is new game+ you finish this one with him beating everything and being the strongest then have the system let him know that this worlds his own as a reward and it becomes a inner world for him then you have him reborn in a new game + version of the world where he starts over but gets to keep a few things like the mind skill and can visit his inner world version anytime to go back to his previous power and to relax when needed
honestly multiversal type stories can be confusing but it gave a lot of free rein for writers to manipulate the stories however they wanted by justifying it with another universe thing but if your going to stick to the original theme of the fanfic you'd have to rewrite and remove the overly powered stuff you gave to the protagonist and replace them with something grounded to the theme of the story, and if your planning on going multiversal then go ham with it so long as it's logically justifiable. i like this fanfic cause there is not a lot of inhuman fanfic that makes an MC a monster or not humanoid, it's refreshing to read and root on, honestly i like the fanfic to stay centered on monster hunter cause all the multiverse stories out there always get jumbled up and you had to backread at least 30 chapters back to get a sense of the story.
? Scale of power has nothing to do with character interaction. OP systems have nothing to do with character interaction. Author being BAD at writing character interaction has something to do with character interaction. Plenty of stories where the character is OP that has decent to good interactions.