Maybe try reading Almond by Sohn Won-pyung. It’s 220 pages and a pretty calm book (by that I mean it’s written kinda slow so not a lot is happening at once. The actual contents are… not that calm 😅). It’s about a boy who has a brain condition that prevents him from understanding what emotions he and other people are feeling. It has some death that’re pretty explicit but I don’t think there are any other trigger warnings or anything. I’d definitely recommend it!!
Radio silence by Alice Oseman. I don’t really know why honestly but I love it so much