Re: Alternative Fantasy
China Miéville, Ursula LeGuin (mostly her space fantasy stuff), Mervyn Peake, KJ Bishop, Ken Liu...you're probably too old to get the best out of Michael Moorcock, but he's awesome (why D&D has a Law/Chaos axis, does elves as the actual Tolkienian* baby-eating Gentry they should be, not a kind of snooty feeble human)...Mary Gentle, Guy Gavriel Kay (not the Fionovar Tapestry, though, good grief), Jeff Vandermeer, Robin Hobb...oof but my top-of-head list is white, talk about relict industry bias...nope, I think that's it for really good secondary-world fantasy I'd recommend to any stranger without pulling up a library list.
Oh! Oh wait, I looked across the room at my bookshelf and am going to recommend children's fiction, but if you had a Moomin-deprived childhood then it is worth investigating the even mix of bright, playful whimsy and harsh, distilled Scandinavian bleakness of Tove Janssen's Moomin books. I would give those to adults, they're that good.
*Tolkien had no illusions about his elves, he just wanted them to be "what if Norse heroes were literally Just Like That" - the Silmarillion translates as 'Shiny Saga' and is a tale of spiralling, world-wrecking doom set off by one elf in a position of power basically getting some shiny things stolen and deciding to fight God.