Earlier quoted context omitted.
You don't actually have the right to be forgotten, even within GDPR. That provision was heavily modified before GDPR passed, and the final phrasing doesn't really grant you the ability to erase all of your content from the internet. (If I recall correctly, the term "right to be forgotten" was also largely replaced with "right to erasure" in the actual text of the law, with the intent of indicating that you had the ri…
Of course, let's not get too wrapped up in the GDPR's actual text. It is "Right to erasure" but is still known and referenced as "Right to be forgotten" as well. My intent was to put forth what it is describing, which is to allow the user to request the erasure of their information and subsequently that provider should then take reasonable steps to do so. If that provider, chooses to keep content creators information…
You can certainly take efforts to restrict its movement, as Quora has done here. It's mostly futile, though, especially in this case. Archive.org might not be willing to save it, but I guarantee plenty of comparable services are.