General Discussion

I recognize it's not the same, but you might try posting some D&D related stuff in the games communities that are open to tabletop games. Also looking into it again, I remembered there's ttrpg.network as a whole, and !rpg@ttrpg.network in particular for tabletop RPGs, and !dndnext@ttrpg.network for D&D 5th edition specifically.

With /c/RPG it at least appears there's some engagement when people post, albeit admittedly the last post was a couple days ago (as of this comment).

Edit:
Me being a dense pattern of neural activity: you can try to find your peers in this community as well. My mind went straight to the larger specific interest communities as I'm thinking you may find others more easily there.

However, feel free to make a thread or threads here to try to find likeminded folks until you can get smaller communities going. Whether as simple as, "hey anyone else into D&D" or say cross-posting from a smaller community to here of things like organizing games or whathaveyou.

This isn't strictly to D&D btw, it includes other hobbyists trying to gauge interest in forming, or grow existing, communities. Basically feel free to post (or cross post) about your hobbies here, whatever you may have recently done related to them, and see if anyone else is also into your hobby and if you all might want to make a community of your own (if one doesn't exist yet).