you can follow tumblr blogs via RSS if they've got a THING.tumblr.com page (you want THING.tumblr.com/rss.xml

and you can sometimes (I think it depends on user privacy setting) follow bluesky blogs via https://bsky.app/profile/THING.bsky.social. Though you'll have to click through for every post -- they don't embed like tumblr posts do AND GOOD RSS FEEDS SHOULD.

have various grievances against both but if it's all you've got for a certain artist you wanna follow, there you go.