*all the things you're not interested in anymore. I usually "overfollow" when joining a network — to get things going and finding my community. But at one point it's important to clean up. No use following people for the "nostalgia" or for some imagined obligation. Unfollow ≠ unfriending.
PS: especially newsletters!
@fabian I'm finding myself doing the same as I split my fedi life into multiple topical instances. It's hard at first to unfollow people if only to refollow them from a different account
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).