Is there a site that has hand-curated playlists I would love that let's say if I want to listen to Korean pop from the 90s or Minimal Techno from the 00s.
Here are two that might fit what you're looking for:
'90s K-pop: https://open.spotify.com/playlist/6mnmq7HC68SVXcW710LsG0?si=...
'00s minimal techno: https://open.spotify.com/playlist/6mnmq7HC68SVXcW710LsG0?si=...
There are sites to convert from spotify to another service if you don't have it.
Usually I find them _by accident_ while browsing public playlists on Spotify