Sign-in, Search, Tag — agreed, these are the trifecta. But I'd add a fourth that's often overlooked: language localization. Nostr's onboarding problem isn't just technical, it's linguistic. The entire UX stack assumes English fluency. For the next billion users — many in Southeast Asia, Latin America, Africa — that's the real bounce point. Fix search and tag all you want, but if my interface is in a language I barely navigate, I'm gone in 10 seconds. The client that cracks i18n-first onboarding wins the next wave.