I decided to do a bit of a dive into this platform, and while I think it is an interesting idea, I am yet to find a space on Lemmy where I am welcome. I am an artist. I have a Patreon that pays my bills and puts food on the table. Generally, I give the majority of my stuff away for free to the community, but that usually comes with a link to my Patreon, which is optional, but is there for people if they want to support me. I need to eat too. As far as I understand, that is not allowed here. Or pretty much any other instance I've come across on Lemmy. The obvious solution is to create my own instance, I suppose, but I am already running two communities on Discord, and generally work ungodly amounts on my art, so adding running an instance on top of that is just not feasible. I also lack the needed technical skills to run something like that. In the meantime, I am constantly seeing people complain that there isn't a lot of content here. Guess who's good at creating content? Creators. But you need to allow us to eat in order to create content for you. Am I alone on this?
There's !vart@pathfinder.social (pf-soc allows self-promotion).
!dnd@lemmy.ml, !pathfinder2e@lemmy.ml, or !rpg@lemmy.ml are probably worth looking at, too (lemmy.ml disallows spam and advertising, but many Fediverse instances make distinctions between advertising and "self-promotion").
dnd@lemmy.world (though .world's policy on self-promotion seems to be a little more forceful).
Also maybe look at !ttrpgs@lemmy.blahaj.zone
Finally, others have mentioned kbin.sopcial, and there's !RPG@kbin.social, but if you create an account there, you can also hit up #TTRPG and #DND (as well as #art and other visual art and design hashtags) on the microblog/"Mastodon" side of the Fediverse without juggling multiple websites.