There is now an increasing body of secular literature on how changing habits can help change character (e.g., The Power of Habit, Atomic Habits) but this is not new to us (see Rambam's Hilchot Deot 1:2 and 1:7). Is there a Jewish codified version of such an approach?
I am specifically asking for books (ideally in English) focused on middot (character traits) improvements, e.g., recording of lectures or some form of handbook? I'm thinking of a system to perfect oneself, one habit or midda at a time.
Orchot Tzadikim would be an example of a very early book of that type but I am looking for something more contemporary. I know of a number of similar works on prayer and am asking more broadly.