I can't speak about Fogg's new book, but I've read Atomic Habits and read or listened to some of Fogg's other work. I think you're past the point of diminishing returns, especially compared to spending that time tweaking how you apply it. For example, by making triggers more obvious (daily email nag), progress more consequential (BeeMinder, blog), or goals more fun (choose valuable habits!).

If you want Fogg's take in a nutshell, here's a short podcast interview: https://boxofcrayons.com/2016/08/bj-fogg-on-behaviour-change... . tl;dl: Have an explicit trigger that you can't ignore.