I always find it interesting and revealing when different people offer the same advice. Especially when those pople are not connected and come from different fundamental disciplines.
Charlie Munger, Carol Dweck, and Susan Cain all offer the same advice: Become a Learning Machine.
Charlie Munger says:
I constantly see people rise in life who are not the smartest, sometimes not even the most diligent, but they are learning machines. They go to bed every night a little wiser than they were when they got up and boy does that help, particularly when you have a long run ahead of you.
Carol Dweck says:
You have to apply yourself each day to becoming a little better. By applying yourself to the task of becoming a little better each and every day over a period of time, you will become a lot better.
And this tidbit from Susan Cain, also fits:
…identify the tasks or knowledge that are just out of your reach, strive to upgrade your performance, monitor your progress, and revise accordingly.