[anotheruser092]

I'm also curious about vetted professional communities.

I'm not a part of one, but the only community formed online that I've found to last, was one with a weekly video meeting with a few people from the larger community. This actually outlasted the original community.

It's just so easy for any member to become inactive in the community without regular interaction. Free communities on Discord can plausibly be a great option, with the major caveat that the core interactions are over regular scheduled video calls, instead of mostly messages in large group chats.