Deleting 10-Year-old Unused Account?

Per the title. I set up an account over a decade ago and am trying to have it taken down. It was set up using my old high school Gmail which Google deleted some time ago. I set up a new account and am using that to try and take the old one down. I made a post calling on X Support to enact their Inactivity rule but so far, no results. Aside from messaging Elon, what other steps can I take to have it taken down?