I haven't read but just a summary of the book but even that was helpful in letting me reframe some of these issues that I struggle with.

https://www.amazon.com/Mastery-Keys-Success-Long-Term-Fulfil...

The key message that stuck with me was that the early stages of the mastery slope are exciting because of how much new knowledge we gain. However, most of life is spent in the plateaus, and learning to love the plateaus is key to finding persistence and self discipline.