People in your niche will likely have the same problems. If they love fantasy football, they all need to keep track of their teams. If they enjoy fly-fishing, they all need to find information on where to fish and how the weather will impact their chances of a catch. If you spend enough time investigating the problems of your niche, you will sooner or later surface their critical problems. These are the things that are common roadblocks for everyone in the niche. Solving that problem with a dedicated product will allow you to have a high chance of success with your bootstrapped business.