The title may sound sad, but what I’m asking is this:

Suppose you have an idea that you’ve developed and published, but it fails to gain traction. You then make minor adjustments, such as changes in marketing strategies or slight modifications to features. At what point would you consider the product to be a failure?

What would be the threshold—in terms of time, money, or other factors—beyond which you would decide that it no longer makes sense to continue?