Negative SEO

Raflucs said:

Hi everyone,
A client of mine isn't treating me well...
Thanks to my work, his website is highly ranked with over 500 keywords.
I'd now like to quickly remove all references to the site from Google, causing it to lose rankings and keyword rankings, and making life as difficult as possible for the new supplier.
What's the fastest and most effective way to do this?

However, I'd like to avoid negative SEO with backlinks from spam sites.

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