Personally, diversification is what I feel like is still missing. The coinage here is ultra strong - makes sense, considering how and why this started, really. But the prejudice towards crypto is /real/ - and a real problem also.
The current audience for Nostr is techbros and coiners. Unless we find a way to diversify and slightly de-niche our platform, it will stagnate.
The past months, a lot of focus was put on wallets - and I get it, Lightning was one of the core parts of Nostr and the improvements there - such as with zap splitting, the whole system of zap.stream and whatnot - are amazing. But wallet's aren't "cool", yknow? They're "neat".

Also, missed opportunities.

- Reddit: Nostr communitys hardly work. If we had implemented a better system than kbin/lemmy, we could've literally exploded.
- Yuzu: The decentralized nature of Nostr would've been a great way to let the Yuzu fork maintainers stay under the covers and keep delivering their software. They don't know how to do CI/CD on a node only accessible through tor; but we could have helped. I tried my part on Reddit to invite them, including via DMs, but I was usually ghosted. We need to be "louder". Not obnoxious, but able to be heared.

I love Nostr and I definitively intend to stay and build on it - but right now, I don't see any of my artist friends joining (peeps designing their OCs, furry artists or just general painters that I know) or any reason why someone trying to go away from Twitter to not just join Threads or BSky. Threads can talk to some Mastodon instances now and BSky lives off of lofty promises - but their client works, is /ridiculously/ fast (click "Follow" on BSky, Snort and Primal - you'll see what I mean) and currently has no real stigma to speak of. Nostr is full of coiners. People are wary of coiners. Sucks and sad but... yeah, its a thing. :/

I realize this is far more than "just my two cents" but... eh, this is why I nostr; I can just rant for ages! :D