Advice to artists: create a style and stick with it, become famous and own a highly marketable brand. The same for any business.
Usually an artist chooses to concentrate on one discipline; like classical piano, poetry, fiction writing, or specific type of painting. He masters a style and gives it his own personality, perhaps becoming famous as a brand. If that brand goes big he is world famous. For instance Van Gogh. He made paintings in his own style, not popular at the time, but highly identifiable. Exactly 100 years after he died, Vincent’s painting, Portrait of Dr. Gachet sold at auction for 163 million dollars.
My greatest success as an artist has been as a landscape painter. I am grateful for being able to make a living with my painting (see Steven Boone website). I often pinched myself to be sure I was not dreaming. “And I have not had to be a waiter on the side,” I told folks.