Two ways you can improve the situation: advertising and sharpenning your sales techniques.
Get on the phone and call your friends, your friends friends, everybody you know. Go to a busy plaza parking lot and leave busness card or flyers on the windshelds of the cars.
Advertise in the news papers, "Cars for Sale" magazines.
Also, learn more sales techniques by taking Sales Training course.
If you are in Toronto area I can help you with this, I train sales people.
I hope this will help you.