I would recommend you read Tiny Habits by Dr BJ Fogg. A lot of people recommend Atomic Habits but I will go against the grain and say I don't think Atomic Habits is a good book and Tiny Habits is a much better read.
These books are written to sell, not to be read by the target audience. They're far too long, and their structure is bad. For dozens of pages, there is no actionable advice. The reader loses interest by that time, and the book lands on Tsundoku tower. I suspect short self-help books don't sell well, so each book must have 200+ pages, even if it sets up the reader for failure.