you can do PR submission or write an article about your site. do some blogs too..

The problem with a four page web site is that even the most powerful link building scheme will max out in no time because of the lack of fresh content being inserted into the web site. There's a proportion to all of this incoming link building idea. Externally inflating the volume, relevancy and quality of incoming links quickly becomes a useless pursuit in this case.
It has been a long time since I've seen a powehouse four pager, eight pagers exist but four is a little bit on the puny side. Sure, it can be made to rise in the ranks somewhat with external stimulus but not for long and certainly not to the top bunch of keyphrase competitors. Now, if you think you have an example to show me otherwise, I'm open-minded enough to investigate.
This is why the web site owner should concentrate on marketing sources outside of SEO, other forms of Internet marketing perhaps, as suggested by other responses and outside the Internet altogether.

Hi,

For creating a link building for particular website, Get targeted keywords and do the submissions in a particular category like Article submissions, forum signature and blog posting, directory submission and social bookmarking. this will help you to increase your traffic.

Yes I'll have to agree that 4 pages is a little scanty. It wouldn't take a lot to expand it though. Just add pages using articles, a blog or just more information that's relevant to your site. It's not rocket science but no one ever said that doing a web site was that easy, let alone SEO. You just have to learn the basics and then keep working at it. But I still see no reason that a four page site can't rank well for it's major terms. It isn't written anywhere in any search engine guidelines, nor have I seen any credible documentation that a smaller site won't be able to achieve good rankings.

Now for one of my favorite subjects: Fresh content. I work on several sites for clients that have not added any fresh content for years and still hold top positions in Google, Yahoo and Bing for some very competitive phrases, and do excellent business from them. Granted these are industry related sites and are not really prone to lots of new content. Now a site that has lots of return traffic in arenas like entertainment, sports, communications, web tech, blogs, etc, will benefit greatly from fresh content for your viewers. It will keep them coming back. I never worry much about any sites I work with being spidered because most of them see spiders several times a day from the major search engines just because of the links pointing to them. Spiders follow links and garner information. That's pretty much all they are designed to do. If you're a strong believer in the importance of "on page" optimization then every time you change a page that ranks well for certain terms then you have to re-balance that page. That's not something I have much time to do in volume, and IMO continual addition of new copy does help in your rankings or frequency of spidering.

Articles might work to a certain extent for traffic (if they can be found) and the links are good because the whole page is relevant to your keyword phrases if done correctly. I don't know of anyone who peruses general directories except to find their own links. Forum links are pretty much limited to those who frequent the forum. Not much traffic there, and the links are almost totally worthless for ranking purposes. So for those of you who are madly trying to get as many forum sig links as you can, your time should be used in much more rewarding endeavors. Now social bookmarking sites can provide tons of traffic and some of it might even be relevant to your arena, although IMO the links don't carry much weight for ranking but I'd say they were far better than forum links.

Social bookmarking drives tons of traffic.. Also with social media and networking.. These strategies help boosts the amount of traffic you want on your site..

More content, and build some backlinks too.

other then regular submission like article, directory, forum and social bookmarking, doing Social media optimization like facebook twitter will helps in drawing traffics to site

i do group posting, bookmarking, forum posting, and of course twitter.

Build new content (an in-domain blog is good) and build backlinks to your new page each time.