Who are you?Someone that is following his path best he could and enjoying the process most of the time.
What does it take to make a living with Jazz?Merit may have some influence on this if you are perhaps in the top 5 of your instrument in the world. But for the vast majority of us, it is persistence and some luck and playing good enough and having people skills. Having the 途ight・look also seems to help immensely. In the end, it is probably just who you know and being popular. Sort of like the high school cafeteria.