it has been proven that practicing gratitude and writing it down, improves our outlook on life. While not technically a book, this journal is perfect to help you start and maintain your gratitude practice.
If you have read Atomic Habits, you really don't need this book. The ideas might sound redundant It's basically the same information written from a different perspective, so nothing new. BUT
If this is your first time really considering Habit changing, then start here .It's an easier read than Atomic Habits and it's more geared towards the importance of identity when you start changing your habits. It also includes a 21 day guide to help you modify behavior which I know people will love for the new year.
It's the actionable part for me.
So hopefully, a book on this list of 10 Motivational Books for the New Year is exactly what you need!