Good philosophical books that require thinking

Hey all,

I dont really know how to explain this, but I think I'm looking for philosophical books. I'm interested in books that may change my thoughts or perception of life. Like, what is life? What is love? Things like that. Not that it has to be a textbook, and I don't want it to be. I've read a couple Dostoevsky books and The Death of Ivan Ilych by Tolstoy and I really enjoyed the books I've read. I think I can really understand and internalize what the author is saying. Like being highly critical and looking at other perspectives, thinking about what or how it would be like to be in the characters shoes.

I've really been thinking about how life is short, and that I should unapologetically be myself. I've even bought a few "self-help" type books about confidence and such to learn from them.

Honestly, IDK. I just want some mind breaking type shit lol.