on the reverse side: tumblr struggles to stay not very unprofitable rather than extremely unprofitable, and artists always need more reach and visibility. if you want to support artists, and the site itself, reblogging art you like, and spreading blazed posts that are at all palatable to you, is actually measurably helpful.
i haven’t seen this talked about yet, but: if you don’t want to have blog full of random nonsense, consider starting a themed sideblog! 90s nostalgia, fandom-focused, something-core, everything that’s green. you can be a curator, and other people will follow you if they like the same subject. this also really helps artists! getting your work reblogged by a curated blog with a lot of followers can really boost it.
you don’t have to be creative yourself to promote a creative environment. artists need gallery space, which means they need gallery owners. curators and collectors are valuable too.