Sales conversions for a fleet services dealership

I am looking for a Freelancer to help me expand my customer base for my fleet services dealership in St. Louis MO. My goal is to increase overall sales and improve customer retention. My current customer acquisition strategy is through direct sales outreach. We have over 7,000 fully qualified leads - these companies buy the exact services we sell. I need someone with experience in sales conversions to help me reach my goals.