So far the novel is great, and because of how the "mc" relates to his friends, who are mostly women I think, it seems that he was unconsciously putting together a harem, which would be great.
-If the "mc" is a Muggle-born wizard, or maybe he is not?, but since he does not have a noble and ancient house or political power, he could create one, for example:
- Let's say that the "mc" already eliminated all the horcrux of voldemort, but this one had one under a fidelius, which he uses to revive (you could say that he learned that spell at the last moment or he remembered it, and lamented it in his last horcrux, and when he went to look for and throw it at his other horcrux, the prophecy came to him) u simply did not have any horcrux under fidelius because he was arrogant, crazy and had a very bad head for dividing his soul many times.
- But the point is that he revived, and the war begins, the "mc" could ask Harry to lend him the invisibility cloak, and with that, assault the vaults of all the Death Eaters and dark families, stealing their libraries and their treasuries, and later in the attack on the gringotts bank, the "mc" enters and steals all the gold from the dark families and death eaters, he could also steal everything from the krovius family if they have vaults in the bank, practically ruining them financially. This could be a very hard blow for the goblins and magicians, because the safest bank in the world was robbed, with that the "mc" incidentally could open his own bank.
- After the war, the British and European magical population will surely have decreased a lot, many old houses will have become extinct, there will be chaos, the "mc" can seize the opportunity and create a house, thus beginning its magical lineage, having in the process a Huge collection of books, gold, and treasures that I stole for backup. This incidentally could be used to have many wives, since as they are culturally backward as a society? Harem should not be a problem, besides coming from an advanced age, you will not like how witches are treated by the vast majority of magicians, practically as objects to continue the lineage being married by marriage contracts against their will. so the "mc" could start a revolution, and the witches could notice how he starts a harem and treats his women, and they will not miss the opportunity to be with a great wizard and a good man, and the "mc "incidentally I would be saving them from marrying someone they do not love, since they would come to him of their own free will, things that their families would not do, since they would marry them with contracts to other families to obtain more power, but the" mc "I found a way to destroy or nullify them.
- The next villain could be grindelwald, if he is intelligent, cunning, powerful, if he is already dead, you could say that he simply was a horcrux, and that is why he did not go crazy like tomy, or he found or created another magic that manages to anchor the soul and does not allow it to die, if it is alive, it could have escaped during the war, and during and after it, started to gather followers internationally and be more prepared not to lose like the previous one, although if you already have a villain prepared, you could also put Grindelwald, and that there is a conflict of interest between those two villains, having a war between these two, that could give the "mc" time to prepare and face the victorious villain who would be weakened along with his followers, it would be a war between two weakened sides, the "mc" would win and could use this opportunity to weaken the wizarding world to increase its power, wealth and influence. being thus unstoppable and becoming with time in the head of all the magical world.
- The harem is highly recommended, since until the current chapter, it has been understood how several girls have or could have feelings for "mc", which would be: susan, hermonie - luna (they could have feelings for like "mc" has tried them, and it would be great if she had them), daphne - tracy (they could have them and if they had it would be great, daphne's younger sister could also fall in love), fleur (she could develop feelings and it would be logical since he does not He is affected by his charm, something that could be necessary to be the husband of a Veela, as well as the "mc" treats her and he is mature for his age, he could contribute to her falling in love, his younger sister could also fall in love), hannah (spending time with susan and the "mc" this could develop feelings), lavender (could develop), romilda -tonks (would be great if they do), some have and could have and develop, and most likely these and other witches end up developing feelings for r the "mc" during the war, since this would be his light, the ones that would keep them together, standing, with strength, in addition they would see how powerful, brave and protective he is and could become, what would end them arrow.