Yes, there are a couple of websites that categorise and provide searching for communities across the Lemmyverse.

https://www.quippd.com/writing/2023/06/15/unofficial-subreddit-migration-list-lemmy-kbin-etc.html

https://sub.rehab/

https://browse.feddit.de/

There's a bunch more too.

It's feeling quite good at the moment so thank you for all your hard work.