You might want to check out 'The Book of Joy' by the Dalai Lama and Desmond Tutu (Nobel Peace Prize winner and archbishop). The book lays out what these two men believe are the fundamental pillars of enduring happiness. Instead of doing a poor job summarizing the contents, here's a link to Amazon if you're interested: https://www.amazon.com/dp/B01CZCW34Q. Wish you the best.