There is a good book employing the TRIZ mindset for self-improvement called "How to Be Miserable: 40 Strategies You Already Use"[0]. Although some of the outcomes the book lead you to can seem banal, if you approach them from the perspective of how to optimize misery, it can give you a new perspective. It certainly did for me in some areas.
CGP Grey also made a video based on the book, called "7 Ways to Maximize Misery"[1] that may be easier to digest.
[0]https://www.goodreads.com/en/book/show/25898044-how-to-be-mi...