It is useless to take up a hobby just because it has financial potential unless of course, you are intrinsically motivated to make money like cryptocurrency and stock market traders. Nevertheless, if you must, it would be a good idea to start by exploring and evaluating different monetization options like selling products, offering custom services, teaching, freelancing, and affiliate marketing. And then, when you assess your skill set and interests, you will naturally think about them through the lenses of financial viability.