Your posts and comments will still be available in the Pushshift dumps. These have been released as torrents, so there are many thousands of copies of these already.
and archives on different sites arent used to link to a current digital trail
Like if you were running for political office, nobody is going to start with the archive to try to match to an unknown current user that they further want to link to the candidate. They’ll start with the candidate and try to link to a current username and then maybe extend that to archives of related usernames.
But if you really nuke and start over you’re fine, people just aren’t that motivated. Your own witness protection program.
I rotate all my accounts every year or so, same with this one.