I'm surprised no one mentioned this classic yet: The Left Hand of Darkness by Ursula K. Le Guin

A lone human ambassador is sent to the icebound planet of Winter, a world without sexual prejudice, where the inhabitants’ gender is fluid. His goal is to facilitate Winter’s inclusion in a growing intergalactic civilization. But to do so he must bridge the gulf between his own views and those of the strange, intriguing culture he encounters.

The Culture series by Iain M. Banks is pretty open with trans characters

One of my favorite books is called Fierce Femmes and Notorious Liars by Kai Cheng Thom which is a book about trans existence being pushed into the edges of society. I cried multiple times - its beautiful and devastating and very well written.

Rainbow Black by Maggie Thrash was a book about a lesbian whose parents were sued during the Satanic Panic & it essentially ruined their lives & shattered the family. I personally view it as an individual perspective on class just because I know a lot of the Satanic Panic was a cultural manifestation of deindustrialization, most acutely felt in the Rust Belt.

I personally enjoyed Compound Fracture by Andrew Joseph White which is about a trans man in a small town in Appalachia whose family is in a blood feud with a sheriff's family when his like great great grandfather incited a miners rebellion & the sheriff publicly executed him. Class is pretty obvious in this one. The same author has a couple other books too which I enjoyed.

I recently read Metal From Heaven which is very queer and very left.

I quite enjoyed Everything for everyone by M. E. O'Brien and Adbelhadi. It's set in an imagined communist future and a big part of it is the queer experience.