Hi, Just post unique content & also create natural backlink to your website. You must be banned from Google Panda or penguin update.
IF your ranking drop on Some keywords then you have to check your back link sources which r may be no longer there . Get same PR back links are higher with same keyword in anchor text . As a good SEO always keep your previous submission and keywords list and backlinks list so you can go through all those things quickly when your website position in SERP dropping like this .
Please think things through. The three golden rules for ranking higher in the search engine is: CCL i.e., constantly update the content, constantly get clicks and constantly build more links. Do you like to be cheated? Search engines also don’t like to be so. Artificially created content, clicks and mechanically created links now-a-days don’t work. It needs human touch. So you just concentrate on: [1] Adding more unique contents [2] Manage to get regular views [3] Add more backlinks from various platforms Ranking high will then be a byproduct ...
For one or all keywords ? first try to find out the problem , fix it . Then add more content and promote /share your content on social media/forums/your list/on others blog through guest posting or commenting on relevant article
If your ranking drops.. continue building natural links and posting unique content. The worst thing to do is to try waste time searching for a reason why the site has dropped.
DEAR GIVE GOOD CONTENT IN YOUR SITE AND GET REAL VISITOR NOT USE FAKE METHOD TO GET GOOD PAGE RANKE DO HONEST WORK AND SOON YOU WILL GET YOUR RANK AGAIN