@feditips Both worked well for me. Each offers slightly different tools in addition to the basic scan follows / scan followers.

Fedfinder lets you scan any lists you have (private lists in my case), so if you have lists of people you don't follow but read you can search to see if any of them are on the Fediverse.

Debirdify lets you scan blocked and muted lists, convenient if you want to preemptively pull those over as well. It also handles private lists, but clunkier imo.