Learn marketing and sales! Afterwards, you will have a network of acquaintances who know you, they can roughly estimate what you can help them with, and some m

Learn marketing and sales! Afterwards, you will have a network of acquaintances who know you, they can roughly estimate what you can help them with, and some might be waiting for you to have some free time to help them solve their company's problems. And then you just pick an interesting problem and solve that. Rinse and repeat. It's not a direct path to profits, but over time it will lead to great work opportunities in areas that you enjoy working in.