Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
When you subscribe to Microsoft 365, that gets permanently associated to the Microsoft account used as a digital licence, there is no method provided to move the licence to another account.
You would need to cancel the existing subscription using the steps on the link below, then take out a new subscription on a new Microsoft account.
Before you do that, when a Microsoft 365 subscription is cancelled or expires, you will loose access to the 1TB of OneDrive storage that comes with the subscription, you will need to ensure you have a safe local copy of your files on your PC to ensure against data loss.