When someone says "that resonates with me" what they are saying is "I agree with you" or "I align with you." Once your ideas resonate with an audience, they will change. But, the only way to have true resonance is to understand the ones with whom you are trying to resonate. You need to spend time thinking about your audience. What unites them, what incites them? Think about your audience and what's on their mind before you begin building your presentation. It will help you identify beliefs and behavior in your audience that you can connect with. Resonate with.