Harry potter : The new sorcerer king

After a god destroyed the universe by accident a guy gets reincarnated in the world of Harry Potter. [i only saw the movies(incluing the fantastic beast movies), played the games (from the first one on ps2 to the latest one (hogwarts legacy) and even the lego's one) and read some fan-fic so i know a thing or two about the universe of harry potter but i don't know everything ! So just tell me if some things in the story aren't right ! There will also be slightly AU. Also english is not my motherly language so i can make some grammatical errors from time to time so please tell me if i do one]