Best way to transfer content without 301 to other domain?

Hello,

I have a website that I think might be punished, perhaps because of backlinks or other off-page issues, and I definitely can not say it. But the content is high quality, so I've considered moving it to another domain, but the 301 redirect is likely to enforce all penalties in the current domain. What's the best way to move the current content so that Google does not consider it as a duplicate?

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