My website sells many different products. I have already purchased directory link submissions and that along with artlicle marketing and social bookmarking has gotten certain keywords rank top on google to remain on top google should I target keywords of products that I haven't use in the past or continue to work the ones that are doing well now?
It depends on the products that u selling in the site. If products are targeted for particular domain, you should use the targeted keyword
yes. It is better if you could put the product name also in keywords. just imagine there are people they tempted to put name of the products in google search, so if you can grab that it is good for u!!