Play better golf.
...
Seriously now... just play the game, and when your rank reaches a certain level (somewhere around 65-66) you'll make it to Master.
Don't be in a hurry though... Longest tees, fastest greens and stiffest competitions for real prizes await you when you get there. There are many, many posts from people who rushed to the rank of Master whining that it's too hard and they want to go back to Pro.
Just play and have fun.