How to stop getting charged for an amazon subscription on unknown account

I switched around my amazon accounts and they are still sending me an electrolyte powder every few months, but for the life of me, I don't know which account it is tied to.

I have probably replaced that credit card since, too, but the cc just updates to the new one. With their customer service being so incompetent, how do I even go about locating the account to cancel this subscription?