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Hopefully someone else chimes in but I know that there's one app that allows you to export your Reddit communities here. [Finds Lemmy communities of the same name as the Reddit ones.]
Voyager has this option, but I did not use it, so I don't know how well it does.
I search for a community and add the one with the most users or most recent posts. If it isn't active, I find a less broad topic that would encompass that community.
I also spend most of my time on "all" and find active communities that way