my site as get ranked some keywords.Now suddenly its dropped down not even one keyword ranked in google. so what is the statergy i have to follow.
Was it a new domain? it is called sandboxing effect, keep getting relevant back links, and put some unique content weekly.
Building backlinks (especially quality links) is the key... Join and post on Social Bookmarking sites like digg, propeller....Forum postings, directories submissions...
This is normally happening in Google SERPs. Just keep on improving your site, SEO it ethically and be patient.