
ASTER:
disconnect my social and communication accounts
It's not possible to remove social accounts oneself then? That's a different and very specific request. Someone with access to the members' database could probably delete the info for you. Otherwise block MDL on the social accounts' side.
For email, make a throw away account somewhere free like Outlook and switch your MDL to that.

ASTER:
"I want my work to live on without an owner."
Remove your avatar, profile info, whatever else you want disappeared. Change your user and display names to something not associated with yourself and leave.
It will have the same effect without asking the devs for what could be a major retrofit of the site code.
And if you're very certain that none of this will work or meet your needs, make a specific request to admins asking for help disconnecting your socials. They'll need you to have an email but it doesn't have to be one you'll continue using.