!dnd, !pathfinder2e, or !rpg 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).
Finally, others have mentioned kbin.sopcial, and there's !RPG, 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.