One of the highest things I can hope for in another human is that they stop harming others. The world is a better place for it.
At the same time, I admit that I struggle with someone who harmed in the past -- Nelson Mandela. He was a terrorist, was imprisoned, got turned on to Marcus Aurelius, changed his course, and chose to instead peacefully pursue his goals of liberation. I struggle with him having received a Nobel Peace Prize when he'd been a terrorist, and yet he's an example of exactly the kind of reformation I most highly value. So I can see how the past would follow someone, and I can see how wonderful change is. It's complex. OP, if your shunning is just, you can bear it well, and if it is not, then the judgment is the problem of those who judge, even though you are the one feeling the impacts. Also remember that this is fresh to then, and over the course of time their attitudes may change. If you walk tall and keep doing the good that you do, it's the consistency in behavior that proves your character changed for the better, and if they see it then hooray, they are capable, and if they are not capable, it is imo and lived experience likely we'll that you are free of them. I advise to take the long view.
Most people don't change, it's so fucking hard to do and requires such backbone and inner power, I know from my own experience. If my mother were to take responsibility to change herself and do so, I would be so happy. I don't want her to self-flagellate for the past but to change course away from abusiveness and oppressive and controlling behaviors. I would respect that so much! It wouldn't undo the hurt, but it would be a salve, and she would be safer for me, and therefore the world would be safer. The world is safer because you took the responsibility to change.
OP, sending you respect. Sorry to hear you're experiencing shunning. Social animals suck. They do shit like that. Hopefully in time they'll see the value of the change you made and the personal power it took to do so. I wonder if they themselves have such power.
I was shunned by my family for not buying into their revisionist history and demanding the actual history be addressed. It's actually been great to be free of them. Here's a quote about how exile can be beneficial, by someone who was exiled and benefitted from it, Musonius Rufus:
"[Those who are exiled] are not annoyed by their kinsmen nor by men who only seem to be their friends, who are skillful in fettering them and dragging them away from the pursuit of better things[.]"
I don't know about you, but my mother and her enabler, my father, constantly sought to fetter me and drag me away from the pursuit of better things, and in fact punished me for pursuing them. Fuck that. I hope you experience the freedom to pursue better things if that is something you hope for yourself.