That's awesome traffic! How are you getting leads right now? Paid advertising?
Also to echo the previous point, a URL would be super helpful to figure out what's going on.
One way to potentially boost your conversion rate would be user research to determine what's stopping potential buyers from taking that last step. If you sign up at DetailedFeedback, we'd be happy to help you figure this out! We're designed to help startups liked yours answer these questions :)