I have a pr 3 neck brace website i only sale my invented patented neck brace pls help

[shaneo]

My page rank is 3 i get a lot of traffic to my website shanes neck brace how can i rake in more money from my website i know nothing about marketing and little about editing my wp website i come up 1st on keyword neck brace ,neck support ,neck braces neck support brace the keywords go on,please help me out here i get about 30 sales monthly get almost 100 unique visitors 160 page loads 10 returned daily,can anyone help me in this situation,should i carry more products if so what should i put on the site what kind of products duhhhhh

Thanks for all your replies as i need them !!