Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Greetings!
This is Tin, I understand that you would like to transfer your subscription to your new account. However, it's not possible to transfer a subscription to a new one, but the good thing is you can just cancel the old subscription from the old account and just purchase to the new one.
To cancel subscription or just wait for it to expire, if you wanna cancel it, you can go to https://account.microsoft.com/services and sign in your old MS Account.
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Note: If you have a lot of files that is saved to your Onedrive, please make sure to back it up first or save it to your device before cancelling your subscription.
Thanks,
Tin