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.
Read the book because the video got me interested, one of the most entertaining reads of my life and definitely the one book that could somehow count as self-help that I'd ever recommend.
I have always had trouble making short term attainable goals. For example I want to restart doing yoga. But it's been a few years since I've done yoga and now I can no longer touch my toes. Whereas before I was able to do the full primary sequence of ashtanga. Every time I think of my decline it kills any motivation to do anything to stop it. Anyone have any tips?
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...
[1]https://www.youtube.com/watch?v=LO1mTELoj6o