You did some research and concluded that your idea is promising. But do you trust your idea? If so, build your product, and stick with it, and push it for as long as you can. It may not take off right away, so you need to have a great deal of optimism to keep things moving. Maybe your product will eventually become successful, or maybe it will bring you other profitable opportunities. So, do you trust your idea, or you need others to convince you to trust it? My point is that if you don't fully believe in the potential of your product or idea you're gonna have a hard time.