Yes, I know who to take over. Get out of my head. (Don't go actually, just bear with me)

20(ish) years earlier...

Minerva McGonagall. Age: Really, really, really, really old. She's the current headmistress of Hogwarts. Seems like you knew what you were doing. She's the top dog and why not go and establish yourself as the alpha? But returning back would mean you, Ron, Hermione and everyone else have to be in Hogwarts. (Except the muggles, Molly, Arthur, Narcissa, Lucius as they are too old to be in Hogwarts. Fleur as well as she's from Beauxbatons).

PS: Continue this path if you love going in for alternate history. Everything is different here as you fucked up the timeline using the time turner. Voldemort and Dumbledore may or may not exist.

Author's Note: A whole different story. Might lead to bad endings but is more immersive and controlling. Would love to know if you guys are okay with this :)