Self-reflection is a vital part of improving any skill, and improving your life.

Write two letters: 

• One to your self, one year ago. What would you tell them about the coming year? What would you have done differently?
• One to your self, one year hence. What do you want to make happen, what's important to you for this year?

Seal up the second and put it somewhere you'll remember to read it in a year's time. (Perhaps hide it in the christmas decorations you still haven't taken down yet.) In one year, read it. How much have you changed from the person who wrote you this letter?