I get what you mean. It's tricky. I think what you're observing is that it would be ideal to have a community for RPG stuff that is NOT Dungeons & Dragons. It's tough that most communities are built around a certain game, and there isn't quite enough activity on Lemmy, I think for one just for Shadowrun.

If it's of any use, I moderate a community for discussion of a game myself and friends are getting ready to release. It's a street level sci-fi setting. It's not very active, but if you're looking for another place to look for RPG discussion after the usual ones, it's at least cyberpunk-adjacent.

Incidentally, I just searched for what combat like a dolphin means, and I'm gonna post it over there on. We're at !fullyautomatedrpg@slrpnk.net .