Main Domain got disindexed

Main Domain got Disindexed

Hi Guys one of my blog ranked top for certain keywords but unfortunately now it is ranked very low as I can not see them in the search for my previous top names . I do not know whats the reason but suddenly my site got bad ranking in google.
If there is some one who can help me please contact or you can ask me for further other options
Please any help would be appreciated.

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