For one, we need to invite our friends. I've been waiting for kbin.social to stabilize a bit before asking friends who are less tolerant of glitches and rough edges.
Second, I think we need to be welcoming, kind, and open. Please be very sparing with downvotes/reduces and other "feels bad" signals that push people away from participating.
Finally, I don't like advertising in other communities, but if there is a thread here that is especially relevant in another community, consider politely linking to the thread as it may be interesting to those folks.
Those are my thoughts.