We have a nostr:nprofile1qqsgjuekk465vze6c8ps0vdejmvj3fd8tzcqg60kfp20qjk2p9p368gpr4mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmp0qy2hwumn8ghj7un9d3shjtnwdaehgu3wvfnj7qg4waehxw309ahx7um5wghx77r5wghxgetk9u6uarks Skool community with 140 members around the world. We just launched it in July.
Skool is not connected to nostr (yet) but we do accept sats for lifetime memberships.
It's a bitcoin-focused community but there are many different topics and threads. Members can create their own threads too.
https://www.skool.com/maplebitcoin