Curate, connect, and discover
Most autistic writers will advise you to have, at the very least, two autistic characters in your story, if you want to have any at all, and I'd say this applies to pretty much every marginalized community and minority.
Stereotypes are easier to fight if you have multiple examples of a community in your story and show how different two or more individuals can be despite the one or few thing(s) they have in common.