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I'm currently planning to start working together with the steemcleaners who flag plagiarized posts into oblivion. Those posts aren't deleted but won't be shown on the new/trending/hot pages anymore.
The new posts of those users will immediately meet the same fate, so over time, the tag should improve.

That's very draining work though, so another option is to just keep posting good content on a regular basis, you will get recognition at one point. Just don't give up! I'm checking out your posts now.