Before product-market fit, find passion-market fit.
Building a product is a process, not a discrete action. And the Internet is efficiently arbitraged. Every single simple thing that can be done is being done, or has been done. The lesson of history is that product-market fit is very precise—one wrong tweak or slightly bad timing and you can miss the whole thing.
So the only way you’re likely to find product-market fit is if you’re almost irrationally obsessed with the market and if you’ve been working on it for a long time. Where the journey is the reward. Then, you’re likely to have unique insights (in the details) and consistent execution, through thick and thin, to find fit.
Often, the best companies are ones where the product is an extension of the founder’s personality, which shouldn’t be a big surprise, since everyone is passionate about themselves.