To be an artist you need to have a reason for your expression, a personal focus that causes you to express your unique style.

What do you want to say? What do you want to shout out to the world? What is important to you?

You need to know what you are going to say before you speak. You need to know your song before you sing. You need to know your goal before you begin your creative pursuit.
Work out what you want to express before you frustrate yourself with vague meanderings on your blank canvas.