Man, this was my exact struggle for ages. I'd be buzzing to start something new but terrified of reading a synopsis that casually drops the hero's tragic death in chapter 400. My absolute sanctuary is the 'What should I read next?' section on some Korean fan-translator sites, not the ones hosting the novels but the community forums attached to them. They have these wonderfully cryptic recommendation threads where people describe the vibe—'looking for a regression story where the MC is just done with everyone's nonsense, but with a crafting focus, no romance'—and others reply with just titles and maybe a one-line hook that doesn't give anything away. It feels like asking a knowledgeable friend.
I also lurk in the weekly 'What are you reading?' threads on a certain subreddit dedicated to translated novels. People post updates like 'Just started 'The S-Classes That I Raised', no spoilers please!' and the comments are usually really good about just saying if it's good or what the initial draw is, without details. You have to learn to skim past the deeper discussion threads, though; those are minefields. My method is to find a title mentioned in a few places, then go look up its summary on NovelUpdates, close my eyes, and just check the tags. If the tags look good and the rating is high, I'll dive in blind. The first three chapters usually tell you everything you need to know anyway.