What I'd do in your situation first is to pick several niche markets that I believe have the highest potential to have a need for my product/service and I will find a way to connect with them, to call them and to ask them what are they biggest pains/struggle in your business/personal life.

I have found out that the best way to find out what people need is to ask them what are their current problems and after that to try to come up with a solution for that.

You can try to connect with these people on LinkedIn (that worked very well for me), Twitter or try to call them straight away in the company they are working for.

I had a great success using cold calls for idea validation & extraction. I've managed to reach people from many industries, CEOs of Fortune 500 companies, etc. just by being proactive and wanting to learn more about their business.

Not only that but these calls helped me for my inbound marketing campaigns because I knew how to craft value propositions especially for my "niche" and to increase my success there as well.

I'd love to teach you and to share my experience with you so feel free to schedule a call if you want to learn more.