Eh. What do you do if you were once a villain and also a good guy in the same canon, but you realize in your current understanding no-one from your canon would say boo to you if they knew you were once the bad guy and you get lonely????

It took me a moment to parse this question. I think that what you asking is about being rejected by others from your canon for being evil?

Honestly I have never had a problem with people being unwelcoming in this universe, as far as fictives/fictionkin go. In my experience, if you are from the same canon as someone else, they are generally eager to speak with you, even if the two of you were enemies in your previous incarnations.

So my advice is to get out there and talk to people.