Delete myself from the internet. Best way?

Thinking about how many websites and services that I've submitted my details and data to over the years makes me a bit sick. Looking back I regret not creating an alias for use instead of my real details.

I of course use a different password for different sites.

I'd like to take on a project to completely delete myself from as much as the internet as possible. (Assuming that when a service allows details to be deleted they obey GDPR …

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