I just block meme-posters and meme communities and my Fediverse stays interesting as a result. No need to convince/wait for the world to change when I can conveniently block the slop myself, it's one of the most appreciated features of PieFed/Lemmy imho.
Recall that whole db0 defederation of feddit.org? Was not a problem for me at all because I had already blocked the instance long before the whole thing kicked off simply because I didn't speak German and didn't want my feed full of German posts I couldn't understand anyway.