This reply might sound strange.
- Deep Work.
- Atomic Habits.
- Getting Things Done.
- The Bullet Journal.
- The 7 Habits of H. E. People.
These are very practical books (almost self-help, without offense), that have helped me very much for memory, because they helped me to put order in my life, generate habits, set goals, etc., that allow me to use the tricks that I have learned in memory books and in this forum. I am a very impractical person, so even if many of the things written in these books are obvious and very much is just common sense, still sometimes we need to be reminded about common sense.