Practice

They say "practice makes perfect." Of course, it doesn't. For the vast majority it merely consolidates imperfection.
Henry Longhurst

This is why it is imperative to receive regular instruction, and to listen to that instruction. If you are honest with yourself then you can find little instructions everywhere. However, for the big ones you need someone you trust to wake you up and point the way, otherwise there is always the tendency to practice what you know rather than what you need to know.