That Lemmy browser is great for finding communities. In addition, if you want to see what communities people on Lemmy.nz are subscribing to you can click the Communities link at the top of the page (or in the menu on mobile web page, or there will probably be a communities section in your app).

Here's a link: https://lemmy.nz/communities

The Local tab will show you the communities we have on Lemmy.nz, and the All feed will show you popular communities across all servers we federaate with (ranked by the number of people on Lemmy.nz that are subscribed to them).