[znpy]

Not sure if "the best", but one of the best was "A Psalm for the Wild-Built" by Becky Chambers. I was reading it out of curiosity for the solarpunk genre, it ended up helping me a bit on the self-acceptance side.

Other than that, "Il deserto dei Tartari" by Dino Buzzati (in english: https://en.wikipedia.org/wiki/The_Tartar_Steppe). Gave me some different point of view when thinking about time passing by. This was actually an audio-book, but I don't think there's any difference.