I think the strongest incentive for nostr comes from the "own your audience" or better put "own your connections".
This comes from owning your online identity.
Nostr will be the only place where you will be able to build a reputation that lasts FOREVER.

Comms need to be directed towards people with something to offer: Serious content creators, businesses, freelancers, open-source project leaders etc. They have skin in the game as they will ALWAYS lose their hard-earned reputation until they realize, on nostr your connections i.e. your reputation cannot be rugged. Don't waste your time on silly normies with nothing to gain, nothing to lose.

So the message becomes:
 "If you start to build your audience on nostr apps you will make compounded gains without the fear of rugpull - Otherwise you will be left behind by people who made that choice earlier.
 Sure it takes courage. Sure it takes work to onboard your audience and explain how things work here differently but this is such a small cost compared to the guarantees nostr provides: Your everlasting online identity that cannot be canceled, corrupted or owned by anyone but you."

Time is on the side of builders on nostr.