Content theft?

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My website content is purely original and was made by me. I composed it on scratch before putting it on my page. A few days later after I checked plagiarism on my site, I found out that there were several copies of my content on other posts and blogs. Now I figured out why my site is sinking on google ranks because of those idiot people who copied my content. How can I recover my good ranking on google, it was all my original content stolen by morons. Is there any way to to it? Please help.