mc should have at least somewhat numb emotion or detached from the world after spending so many years in the void all alone but he is actiong like a fanboy who meet his crush
mc is a weeb and every weeb know magic is influenced by emotion i think he should have been able to figure it out by atleast 2 or 3 months not years and think of it like he made a new discovery
i think option 1 or 2 both will be good. and i would like to recommend the type of personality of mc like the mc of the fanfic Deal with the devil by crossedge
according to the situation mc have gone through so far he should be a little more cold and ruthless i mean he was in the void and the memories of harry potter should make him more ruthless because they are all bad
MC is very passive when it comes to deal with protagonist and other characters i mean he has enough influence on xiao wu to not admit her to tje same acadmey aa tang san