"How can I do even better?" is a valuable self-talk question that can help you improve all areas of your life, especially after making a mistake. Asking this question is much better than excessively obsessing over mistakes, because it will help you improve.
Develop the habit of consistently asking, "How can I do even better?" Even after a tremendous success, we can ask ourselves, "How can I do even better next time?" Those who constantly ask this question will constantly improve.
There is a well-known saying: "We learn from experience." Let’s reword this slightly: "We have the potential to learn from experience."
Some people have a lot of experiences, but they don’t learn from them. They just repeat the same patterns over and over again. However, a person who keeps asking himself, "How can I do even better next time?" will learn from each experience.
(from Rabbi Zelig Pliskin’s book: "Conversations With Yourself", pp.204-5) [Artscroll.com])