For having a living of your art you need dedication , determination , courage, obstinacy , patience, High defense, magic defense, Speed, Dexterity, Stamina, resistance, fire resistance , sleep resistance , hunger resistance, Nerve cracking resistance , Ice resistance, Sickness resistance, distraction resistance, Youtube resistance, Netflix resistance, Facebook resistance, Twitter resistance, All the freaking social platform resistance and pretty much a lots of concentration and motivation!
and also Love of your works...you actually not really live from art for having 100000000000000$ pers years most artist draw because they love it and gain money because they want to being able to just draw after.
If you aim with the idea your art is for gaining tons money and not for the pleasure of drawing....better drop it because it's extremelly hard to live from your art. Unless you become a famous author with one millions art sold or work in a company ...you will not get rich and will still need a extra jobs for filling bill.
think money's as a reward of your hours of passing in front of your canvas / sheet / computer just drawings...not something you automatically need...