Collaborative document and spreadsheet editing 
Event sign up with calendar integration linked to your keys, with options for public and private views of said calendars 
Self-hosted CDM and relays that can be spun up in minutes with automsgic failover 
All the lists, being able to make them public or private 
Nostr POI map overlays, being permanent or ephemeral (like the pub in NYC vs. Event layouts/rooms) 
Private group chats 
Walled garden relays, again easily spun up 
A relay dedicated to cheese 
Communities that don't suck 
Better key tools
Interoperability with monero as a just in case measure
Parent/child keysets