You need to be very specific in how you clearly convey the value of what you provide and how it can impact their position and company. As written below, LinkedIn will help you identify but then you need to start your outreach. I have a "prospecting" approach that uses email, phone and mailers (yes mailers) along with specific time intervals that has proved to be successful in building awareness and getting in front of decision makers. If you would like to see it, please let me know.

Above all, you need to have some grit and simply just start your conversations. If you believe in yourself and your product, it will come through in your conversations and people will be drawn to speaking with you.

Good luck!