One thing that annoyed me about moving to Lemmy was that I’d lose my subreddits and that looking for and joining communities on Lemmy would be tedious. So (logically) I spent 2 days writing a script, that gets a list of your subreddits from your reddit account and looks for communities with the same name on Lemmy. It also joins those communites. So all you have to do is download, enter your credentials and you’re done.
Ah gotcha. It looks for the community on lemmy.world. It also searches for the community with the most subscribers. So for example you’re looking for “videos” and that’s on lemmy.world but also on lemmy.ml with more members, in this case you’d be subscribed to both.