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That is not something we can help you with.

Common causes of massive drop in rep are:

  • Spamming
  • Scam
  • Plagiarism
  • Content Theft

You would need to resolve these issues and build your rep back up the hard way but earning trust back.

After i commenting here @reneenouveau this guy downvoted my all posts.Why she is doing this? i am new here.For one mistakes why you doing this? please tell me something

I do not know, you would have to talk to them.