Glad you it. Lots of people don't like Kurt Vonnegut.
"Player Piano" is his first novel and is becoming too real these days as everyone is losing their jobs to automation. It is a good one.
I read some of his books as a late teen who often felt like everything was meaningless and often wishing I hadn't been born, so with that mindset, my favorite books were:
"Breakfast of Champions" - Which I struggle to describe but I read it often enough that the pages fell out of my first copy.
"Sirens of Titan" - Shows that life really is totally meaningless.
I'm going back through his books 30-40+ years after my first read. It brings back some weird sensations. It is like LSD flashbacks. But I get more out of the stories now than I did then. (I have reread one here or there over the years so it wasn't 30 years in-between reads for all of them.) Reading them now, from a worldview that has been greatly influenced by Jonathan Edwards, gives a different perspective.
I also like the others from this list of top 10: https://www.publishersweekly.com/pw/by-topic/industry-news/tip-sheet/article/72006-the-10-best-kurt-vonnegut-books.html
My introduction to Kurt Vonnegut was in school when we were assigned reading some short stories out of "Welcome to the Monkey House". I read the assigned ones, then read the rest of them, and the rest is history. (I don't remember if it was junior or senior high school. Probably high school, but early on, like 9th grade.)