Each year more and more people are buying smartphones and other devices to surf the net on the go. Chances are you do this yourself now! You need a mobile site so that they can find your business.
Desktop sites and mobile sites are quite different. Regular sites look terrible on small displays screen such as those of mobile devices. Your existing site has too much information that is crammed together to fit that small display screen. It makes it very difficult for visitors to get the information they want. Try it yourself!