There is !adhd@lemmy.world , but that seems like a more casual community with memes. Is there one that is more focused on information with tips, strategies, and personal stories? I feel like that would be a really important community to have on Lemmy, if not already made
I’ve also found that it’s extremely hard to find out whether a community already exists in another instance. You have to literally go there and search for it. Which I think is a technical hurdle. Federated instances should inform each other of this fact automatically. I just searched for a community for hours, found none so decided to create it myself here. When I shared it over on Reddit before the big blackout goes in full swing I was promptly informed that such a community already existed, but in another instance that I didn’t know existed. That community just has been death for 2 years inactive. Oh, well.
My advice is, whatever, just create the community you want to see and we’ll sort out fragmentation later. I get it if you don’t want to moderate yourself, but this is just the big challenge of federation. Maybe fragmentation is not that bad of a thing, we’ll see in time.