SEO Work even after geting good rank

What to do if you have achieved number 1 ranking in different search engines.Story doesnt end over here only, to keep the ranking you have to more cautious otherwise next morning when you will wake up your competitor is on top of you.

So keep link building program alive, research for new keywords everyday.I mean to say give atleast 2 hrs everyday to your site.Analyse the visitor behaviour etc.In this way only you will be able to keep your ranking.