[nobody9999]

How does your client (or any nostr client) deal with discoverability?

I'm not piling on nostr here, that's an issue with ActivityPub as well as most decentralized platforms/protocols?

[assetlabel]

You can look someone up like [e-mail] and if he publishes his nostr information in a well-known file, you'll know where to follow him and what his public key is: https://github.com/nostr-protocol/nips/blob/master/35.md

Of course this doesn't work for people wishing to remain anonymous.

[Cameri]

I'm not working on a client. But some of the ones I've used have a Global Feed/Explore section like Astral.ninja and Damus.

I wrote a simple directory you can use to find users and channels here: https://nostr-fzf.netlify.app