I have check it your site using gtmetrix speed test, and its good enough. Your site loading around 3sec, and the speed score around 90%. Also, I have check it your daily visitor, its good enough too. You get daily visitor around 200 traffics/day. But why you still not conversion, its a complex problem, such as your products price, features your products, etc. Basically, in here, you should be analyse what caused your product still not sold.