I'm about to say something that's bound to sound a bit controversial and radical, now I know from experience that it isn't easy, BUT.... Creating a successful startup is not "rocket surgery" ! The most important thing is to ensure that you have the fundamental elements in order. Create something that you (and others) want or NEED.
Is your idea "cool" OR is it "useful"? If your answer is that your idea is "really" cool rather than having a purpose, or even better fill a n