Few websites copy or explore my content, what should I do? [duplicate]

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  • Our website has been copied 100% and mirrored on a different domain.

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  • Another site reflects and ranks above my site in the search results.

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  • How much of your content should be copied before you can file a DMCA complaint?

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I noticed a major change in my SERP over the months and I realized that few sites copied my content. How should I complain to Google?

Is there a general criterion for this?

There are provisions of Google that I understand. But are their policies clear on this?