Take a look on Amazon, specifically in the self-help section of books. How many do you see that approach life outside in? All of them, essentially — except for Three Principles books, of course. Despite the book’s claim, tidying up, I can tell you, has no magic in it!
P.S. Have you read The Joy Formula or Mind Yoga? If so, I would sure appreciate a short review on Amazon. It would help other people to find the books, which means you’d be helping those folks who need less stress and more joy in their lives. Many thanks.