Create what you would buy.
If you become your first customer then you automatically come out ahead. The worst-case scenario is that you gain a product that you value.
As unique as you think you are, there are thousands of people like you in the world. Once you have the product that you value, the rest is simply finding other people like yourself.
If you create a product that you value at $500 then you simply need to find 2000 people like yourself and you have made your first million.