A book that made me very introspective was David Brook's The Road To Character . It made me ask my self a lot of questions which I have documented here https://www.deepthoughtapp.com/packages/55/david-brooks-humi...
Another book was Paul Kalanathi's When Breath Becomes Air I also copied some quotes, questions, and answers here https://www.deepthoughtapp.com/packages/135/paul-kalanithis-...
I'd recommend reading biographies because they can help you give perspective about how a person leads their life. The ones I found thoroughly fun was Trevor Noah's Born a Crime, Phil Knight's Shoe Dog.