I need a happy utopia book

I’m a poor millennial with the Christmas blues. I feel like I’m alone at the end of the world. I’m not looking for sympathy. Could anyone share a book recommendation to help, though? Right now, I could go for a story about a genuinely happy utopia that doesn’t have a lot of corruption, like we do. No romance focus, please. I don’t want to feel bad about my life. I just want to know that better possibilities exist, maybe on the other side. I don’t know. Is there such a book? Something to make me smile, not cry because the characters have something I don’t? Something introspective, but in an optimistic sort of way?

(Cross posted to the cozy fantasy subreddit. I’ve already read The Spellshop, Heretical Fishing, Becky Chambers and Legends and Lattes, btw.)