You're putting the cart before the horse here. Work on your site's content first. It's by far the most important thing. What is it your visitors come to your site for, if not the content?
If you try using tricks to gain a short-term increase in your traffic (and it will be short term, because none of these things ever gives lasting benefit), what good will it do you without great content? Sure, you may get visitors, but if your content isn't good, they will swiftly leave and never return. Build up good content and the traffic will increase gradually and naturally, as word spreads about your site.