How should I revise a page for the new panda?

I have a site that has about one and a half maybe two years age. It use to rank on page one, position 3 for my main keyword.

Shortly after panda hit I fell to page two and some of my sub keywords rose.

Now, that's not all too bad, but I haven't made a damn penny since. And my main page (the one that got hit) ranks for my main kw and my secondary kw's So how should I revise this page (static page obviously) so I can try to regain my ranking for my main kw and keep my other kw's rank where they are?

I believe it is almost a fruitless effort, but I don't abandon ship so easily.

As far as Panda update is concerned, it has another facet.

Websites which have high quality content get a boost. So, other blogs in your niche might have got the boost and hence you lost your traffic.

If you believe in fighting till end, rewrite all your content and conquer the rankings.

All the best!