Reviewing competitors is just a start. Many competitors can be just as lost as you are or worse. It's best if you can pick up an idea or direction.
Once you cherry picked what can be duplicated you are back where you started. So best to step up your game and ask yourself, what are alternative search queries, niches, and approaches? Think of DMOZ topic taxonomy, how topics are ordered. Click through websites, see who they think are resources. The idea is to find alternative niches that haven't been mined. I have rarely found a niche, either for clients or myself, that didn't have more.