Could a page like this be an idea for new Nostr people? Does it already exist? TLDR; Please check it out and share your ideas. https://www.npubs.world/

More: I imagine a categorization/ranking system of npubs based on, for example, the number of notes over a period, likes, replies, quotes, zaps, etc., and of course some sort of categorization mechanism.

I don't know if hashtags will become irrelevant over time due to AI, but it could perhaps be a mix. For example, if someone posts a picture of a horse running and uses #running, that post probably won’t be relevant for most people following #running.  

Anyways, this is just a mock-up for now; I can't do all of this myself, but I wanted to hear if you think it’s a good idea to move forward with. #grownostr  #nostr  #asknostr 

 It doesn't seem to show any recommendations atm, or I've not managed to use it lol:)

It could be something. Trending / recommendations are somewhat poor atm. In fact the whole most liked/zapped /replied to etc pretty much only shows you who is the most followed here. Which is often not a great way of finding people (on nostr or legacy social media alike).

But perhaps a good attempt.

I think topica-based discovery and following rather than npub-based discovery is more useful generally. There's a bit of a hybrid here, just going off the landing page and what it seems you are trying to do. :)