Engagement is down.
Nostr feels a bit like an under 6s soccer game. All the activity is entered near the ball and if you don't constantly move with it you miss out on the action.
It takes a lot of effort to keep connecting with people who are active and making sure your relays are still up.
I think communities could solve a lot of this problem, by creating places that are active even if the people engaging change. It's something to keep turning up for, which in turn keeps the connections that are made active.