His reason for reincarnating is really dumb and seems to be an excuse for the author to put him in a magic school setting. Instead of waiting centuries for the world to change their views on amber-eyes, he should campaign for their rights to ensure that he gets the outcome he wants. He's incredibly powerful and unlike many IRL civil rights leaders, he'd be pretty damn hard to assassinate. Sure he might not succeed in his lifetime and probably won't be appreciated by the majority of the public, but he could inspire others to continue his cause.