Earlier quoted context omitted.
I did something similar lately. But it's hard to keep up with local news, now. I couldn't find a news aggregator for my country/province. Maybe, I need to build that myself.
I went through an "unfollowed" everyone in my feed except very close family and friends, the local farmers market, and my local newspaper. Facebook is actually useful now.
It has happened multiple times. I explicitly unfollow someone, never interact with them in any way, and then they again pop up in my feed after two weeks. Somehow if you follow too few people, Facebook just picks some more people for you to follow without ever asking you or telling you.