A book I wish i could read agin for the first time is "A Man Called Ove" by Frederich Bachman. It's just such a good book. It follows an old man who just wants to end his life on his terms, but keeps getting interrupted by things until he doesn't want to any more. The back story of him and his wife is so sweet, it adds so much to the depth of the character of Ove.
A book I come back to frequently is "Kingdoms of Light" by Alan Dean Foster. It's a stand alone --although I would read a series happily-- and also a relatively short book. It's set in a world that has been robbed of all color: you follow a powerful wizard's pets as they find themselves put to the task of restoring color to the world after he dies, and having to traverse the inside of a rainbow to do it. It sounds goofy, but it's really well written and an interesting concept.
An Audiobook I find myself relistening to is "Braiding Sweetgrass" by Robin Wall Kimmerer. It's narrated by the author herself, and she has just the warmest, sweetest voice, it's almost like listening to stories from a friend. The book itself is absolutely perspective shifting, and you will look at things differently afterwards.
The Howl's Moving Castle trilogy by Diana Wynn Jones is also great to listen to. The books themselves are incredible, and the narrator is funny and does a good Welsh accent.
An author I will pick up without a second thought is Sir Terry Pratchett. You can pick up pretty much any of them and have a good time. My only recommendation is I'd hold off on the first two Discworld books and read some of his later work first. His early writing is a little rough, but it consistently get better the longer he writes.