How can i increase traffic to my website?

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I have hosted an advertising site. It is now 4th month running. But i am yet to recieve the expected number of traffics to my site. I am asking to my friends in mylot for ideas for it's campaign in shoe string marketing mode, i mean less or no budget mode. I have submitted articles having links to my site in numerous article sites and they are published also. Apparently seems that i am to submit more and more articles for that. May be average 10 articles everyday. That is also quite difficult for me now a days. As some friends told, i am doing the link exchanging everyday. Most of the times, i felt that the traffics that i am getting are mostly from those linked sites. There are many free ad sites. I have submitted my site's ads in those also. Now on average 30-50 visitors are coming to my site everyday. i expect some more; approximately 400- 500 everyday. Can any of my mylot friend give me a better guideline to increase the traffic to my site? Thank you. I have some more sites under construction now. If my this site can draw good traffics that will be a big encouragement for me for hosting them.