It cost me a $200,000 investment to learn this lesson - the longer you spend building something without convincing someone to open their wallet the more risk that you could be building something nobody wants.
Once I emotionally recovered from that failure, my next project started with a very tiny goal: earn $150 within two weeks on a new idea to afford motorcycle Insurance.
My approach meant that I spent literally all my time on marketing, and developed the product I was selling specifically for my first customer. That also means the scope was super small.
The experiment was a big success, and over the next two years I had trained 5 contractors to keep the machine running while I focused on finding people who wanted to pay someone to solve their problem.
I couldn't have been comfortable trying to sell the absolute bare minimum product as fast as possible without being very familiar with the pain of spending years on a product that nobody wanted.
Either you start getting excited about learning how to sell it, or you start looking for one of those people.