You cannot take back the footsteps you have left in the sand.
You cannot take back the words you have spoken in public.
Entropy tells us that it is foolish to try too hard to turn back the clock.
But…we can anonymize your login/password so nobody can ever impersonate you or steal your inactive account. Be warned that this includes you if you someday change your mind.
Let us know in a somewhat less public manner if you choose anonymity, or if you really want to fight entropy.