Now. I've used the https://browse.feddit.de/ to find community's especially ones from the old site, but it wasnt ideal especially on mobile.

Copy URL, switch app, paste, edit, press search, click into community, click sidebar, click subscribe. Rinse. Repeat.

Sync - You open the sidebar, type the term for live search.
Press to navigate, press ... for more. Can sub with 2 clicks!

Now, there's obviously come caching going on somewhere, and the search isn't perfect, but this is drastically easier than search through Lemmy search or Feddit.