@james_clear@dzyngiri Ditto on this one, it's really good, no-nonsense book on how to improve your life. No chapters on "believing hard enough" or anything like that, just straight to the point advice.
I'd say a wonderful one is Man's Search for Meaning by Viktor E. Frankl. It's about a holocaust survivor and his experiences in a concentration camp.
Some great quotes from it:
“Those who have a 'why' to live, can bear with almost any 'how'.”
“Happiness cannot be pursued; it must ensue.”
“I recommend that the Statue of Liberty on the East Coast be supplemented by a Statue of Responsiblity on the West Coast.”