Intriguing suggestions, I can see how they'll spur me to write more & better.
One other I'd add to the list is Daniel Pink's superb book Drive. Applied some of the learnings to help budding writers (like myself) unlock their inner mojo.
Big takeaway: creativity is painful and the “carrot and stick” approach hinders it. Nurturing and cajoling our intrinsic motivation leads to enhanced output and satisfaction - my article details how.