Master, Dabbler, Obsessive, Hacker?

In Mastery, Leonard outlines 4 different categories of the way we approach different activities in our lives.  I have always said, "I am a jack of all trades, master of nothing."  Reading Chapter 2 about the different categories made me think of all the times I have said this.  It is true.  I get excited about a alot.  I try new things, crafts, sports, baking skills, cooking, etc. always learning a great deal but really never becoming exceptional at anything.  This is the art and way of The Dabbler.  How can I change myself and join the path to Mastery?  I think focusing on so many things at once, makes it difficult to become a Master.  Maybe if I focus my free time on one of my talents, I could become a Master?  I am looking forward to continuing my reading and learning more about how to truly become a Master.  What should I focus on first?  Baking?  Tennis?  Piano? School?  I have so many balls up in the air yet I am not catching any of them!