Obsession
There is only one way to know if you are an artist or not, you have to try to measure your level ob obsession with creating that thing that you call art. You are not got to be a great or good artist you will only be one.
How to become a good or great artist I will never know, people do not have enough authentic ideas in life... maybe you will have one, you will be able to realise it and you will become a good artist... maybe you will even have two good ideas, and you are a genius.
The work of an artist never stops, most think of artist as those starting their day around 10:00 AM drinking a coffee with a book on their hands. The true story is that most artist have to work 40 hours a week (or more) doing something they hate in order to finance their work as artist.
Life is mastering how unfair it is to us, to everyone, life does not forgive.