You can still use All, if you block the communities that you don't want to see, one by one. It's exhausting and new ones continue to be added, but otherwise it's hard to know about new communities that come along that you might like.

So like I blocked !memes@lemmy.ml bc of its constant (seemingly not-entirely-joking) call for guillotining irl people including average people who simply were born in a capitalist nation, but subscribed to !tech_memes@lemmy.world that I enjoy much more now - the latter created only a few days ago, check it out!:-)

Also !fedimemes@feddit.uk. Really you miss so much only browsing by Subscribed. But do what works for you, bc I get it: the amount of extremist content on Lemmy is extremely high, and as you say depressing in its consistency.