I used lemmyverse.net to find communities from the subs list I had on reddit, but I'll just have to remember to keep searching after some time has passed since my I won't have my reddit account for reference
Fwiw. I searched 2 ways. Searching “ALL” I first searched for the subreddits I subscribed to on Reddit, usually partial word searches.
Then I searched ALL by topic very broadly, like “music”.
For both searches, I joined communities liberally that had a decent amount of subscribers. Figured those with momentum will probably rise up more over time. So far so good!