I then started to read old self-help from the 1800s/1900s and realized the format was pretty similar(think Orson Swett Marden) of chapters related around real-life stories of success to drive the points home.
I'm excited to see what he comes up with next. He's a great writer. I hope the dilemma of being a #1 NYT best seller doesn't prevent him from continuing to author books regardless of how good they are. In other words, I hope he breaks out of the "habits guy" persona as he has much more great material to write books about.