OP, I wonder if you might be able to find resources or a community through here:
https://autismsociety.org/
They seem to have a helpline resource, and local networks.
Individual therapy has been what I have needed to cope with the effects of my parent's approach to raising me. I think that the challenge of finding ways to accept that your parents did the best they could is very common. It isn't just autism, but also mental illness, or many other things that might cause people to do terribly harmful things in the course of parenting.
So there are lots of us out here who could understand the fundamental goal and challenge, even if our specifics are different.
Good luck finding your way through it. Hugs.