There's a new instance at https://pathfinder.social/ that calls itself "A place for people to discuss Pathfinder and Starfinder tabletop RPGs".
It has a [email protected] for PF2e discussion similar to this community. I'm not sure which will get more traction, but I'm subscribing to both for now. There are also lots of other granular roleplaying communities for pf1e, starfinder, art, and general discussion. They're all pretty empty so far as it seems very new, and I suppose the danger of all that granularity is that each community individually seems dead. But it also feels like a nice topic layout and maybe the topic-oriented instance will make it feel like a community of communities where people sub to a bunch of them all at once. That's what I just did.
You can't use your lemmy.world login to login to pathfinder.social, but you don't have to. You can "subscribe" to communities hosted on pathfinder social, and federation will copy the the posts/comments to lemmy.world for you to read and vote on. Your own comments will get copied in the other direction as well for others to see.
You and I randomly happen to have accounts on the same lemmy instance, and I've already subbed to a bunch of the p2fe communities, check out this set of community search results and just click subscribe on whatever interests you.
To find other fun communities to subscribe to, check out the list of communities other lemmy.world users have already subbed. There's ones for rpg, fate, shadowrun as well. Then if you're still looking for new communities to sub, check out https://lemmy.blahaj.zone/post/61827 which explains the unfortunately confusing process of discovering new remote communities and teaching lemmy.world about them. It's a bit weird and involves searching in multiple places and then doing a bit of a dance to set it all up, but it's not THAT bad once you get the hang of it. Just confusing if no one teaches you the steps.