I was eagerly waiting for a single donation to come to my PayPal. Because I was young and needed to make money through coding without the hassle of managing a business. And I managed to get 0$ donation.

Many devs just code for fun, and are not building in business logic at all. The moment you realize coding is just a fun exercise, it frees you from trying to bake in business logic all the time and try to 'monetize' projects.

On the other hand, if money is the main motivator, you need to build in business logic from the outset and be active on the socials to get leads.