https://browse.feddit.de/ This is a link to the lemmy community browser. It looks like there are 7 communities focused on the blind. I am still learning how to navigate through the fediverse but maybe this will help you find or link to what you are looking for. I used the link and just searched “blind” hopefully the link will show that or you can use it as a search tool to find what you want.
It takes a bit to load. Not sure if it is the search tool or just my Internet being throttled.
i cannot speak about an autism diagnosis and if it will be helpful or not. I did do a little searching and found these results that are united states based. I realize this a global community and the site might not be as useful as your geographically relevant resources but maybe it could help. https://search.usa.gov/search?affiliate=iacc&query=resources+for+adults