Take an interest you currently have that isn't tech related and start solving it. In my case, sports league websites suck (or at least the volleyball leagues I'

Take an interest you currently have that isn't tech related and start solving it. In my case, sports league websites suck (or at least the volleyball leagues I've played in), and I got fed up enough to do something about it. There's always some underserved niche to be found, and you don't necessarily have to seek it out. Eventually, if you keep your eyes open, something will annoy you enough to change.