Discovery? Thorny? Path?
Do you use nostr?
Do you use other networks without algorithms?
I've done far better without their help.
And I'd argue that there is no path.
Tags work well, (obviously, I wouldn't be writing here otherwise) but client diversity is high. Some don't even have tag support.
And the relay network... while better than ActivityPub, is still a non-centralized network.
I haven't seen any tag cloud software, but it's probably easy to write. Just need to hit various independant relays.
That said, I'm not sure tag clouds align with the current spirit of nostr.