For the first time in a long time, I'm doing de-construction revisions. I have taken a book I wrote last year and am pulling it apart and rewriting the guts of it. It's an interesting project. One that is equal parts pulling my hair out and joy at making something good-better.
I started the project as a skill sharpening exercise. Since I have five books out looking for homes I felt that it was not effective to start another. So, I'm using the waiting time to work on my skill set.
IMO, there is always something to learn and improve. Cheers!