Look at soccer. The American Women's Soccer Team reached world-class level in a matter of just a few years. That's my secret. That's the secret for all the top players in the world. Let me elaborate on this a little bit.
Diligence is the most important.
I'm not talking about simple diligence here. I'm talking about diligence with motivation. You need to use your body, and your brain, in practice. I would review my notes on other players' styles before I played them. I've always treated each match very seriously, and I don't make the same mistake twice.