You shouldn’t take this game and opponets so seriously. Take my advices: change ingame nick, use ingame blaklist. Delete your exhibition builds or modify them. Hide your profile, change banner, and ignore toxic players, enjoy the game.
I’m sorry, are you calling @MudnBeer an alt account?
Because if you are, I think you might be letting your paranoia interfere in your judgement.
I also do not buy this theory that your niece is getting harassed at school by other kids who are being controlled by your video game enemies.
I strongly suggest talking to a mental health professional, as it seems like you are really suffering, and need support that you’re not going to get here.