How do I remove the subscriber ID info from my iphone before the 180 days

Hello! Same question as many others but the answer provided did not answer it. Situation is this: I need to remove or reset the subscriber ID for Empire Four Kingdoms in US2 server. It is currently set to a specific Empire account, one I no longer use. I have a new account and the subscription plans will not activate because they are stuck on the old subscriber ID (for old account). I need to reset that ID, or remove it so when I log in from the new Empire account, I can activate subscription plans for that new account. I do not want to wait 180 days for it to reset it by itself. I would like to manually reset it now. Please advise. BTW, on an iPhone 12. Thanks!

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