Speaking to many bitcoiners here and asking about nostr, majority of conversations go like this
"Hey are you on nostr? Let me throw you a follow"
"Oh I have it, but I don't use it"
"Why not?"
"Uh...
Part of this paradigm is that changing habits/behavior isn't automatic. This is why many apps try to force notifications on users. After installing an app, and using it a few times, it's forgotten about as the user gets back to a normal routine. By pestering the user with "Hey! Remember this app you installed?", there is hope that the user picks up usage as a habit.