I have had decent luck in reverting facebook back to what it is for: sharing pictures of my kids with people who care to see pictures of my kids. That means every time someone shares something - no matter how funny - I block the place it was shared from permanently. Slowly facebook is running out of things to show me that isn't pictures of my friend's kids.
Same, it didn't really take as much as I thought it would to get it to stop showing me reshares, but now I see either groups content or family/friends original content.
I dropped all groups too. Facebook's algorithm is a terrible interface for groups - it doesn't show me everything instead just what it determines might be interesting, and doesn't have any means to help with discussion of topics.
