IDK, I still find my Facebook and Instagram feeds very topical and useful to me, so I keep using them. I also curate aggressively, have a wide variety of interests and a few hundred close connections. It could be that I am just fitting into what the algo is steering to, but I don't get the low quality stuff that OP is complaining about.

For Reddit, you can select an option so that it only shows you things from subs you follow. Dramatically improves the experience!