I would write a Nostr Delivery app and a Nostr Marketplace app and apps to help people get out of legacy system.
I have already studied Nostr and implemented some simpler libraries and apps, so I would continue what I'm doing.
Discussion
Nostr Delivery could be tree apps: (1) food delivery, (2) take a ride, (3) send packages as mail.
They would use similar architectural structures, using open street maps and similar tracking Nostr events (maybe userstauses event kind with g tag), all write in angular and typescript and build with cordova.
