I run my own instance and I have created some communities that I loved back on Reddit. I searched and no similar communities seem to exist in the fedeverse yet. Obviously there is nobody visiting them right now, so how would you go about trying to promote it to attract some discussion?
Or post them to reddit. Some subs are actively asking themseld if and where they move. Of course only the willing part, but a simple: “I created this community, see yea” could be enough