Hone your skill

Practice, practice, practice. The more time and energy you’re willing to devote to your hobby, the better you will become. The better you become, the more likely that you’ll be able to earn money from it.

Photography is a terrific example. If you’re willing to make a hundred images a day, you can improve your skills quickly, especially if you teach yourself about composition. You may never become a professional photographer this way, but you can develop your skill to the point where you can sell images to stock photo agencies, or enter (and win) photography contests.

Some people are born with natural talent. Most of us have to work at it.