how to increase our article in google search

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amazed..several months ago, many of my shvoong article is number one in google search.. and sometimes the article from me can beat the article from wikipedia... but now, some of my popular writing even can`t list in top ten in google page.. it`s really shocked me.. so it decrease my payment of course.. anyone can give me information, how to optimization my article so google can list again my article in page 1..??