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