Hi Paul,
Welcome to the Microsoft Q&A forum.
To cancel the subscription for your account, you need to use an account with the Global Administrator role to access the Microsoft 365 admin center and cancel the subscription by following these steps:
Step 1: Go to admin.microsoft.com.
Step 2: Select Billing > Your products, and then select the subscription you want to cancel.
Step 3: On the subscription details page, select Cancel subscription to proceed with the cancellation.
You can refer to the following information for more details:
Cancel your Microsoft business subscription in the Microsoft 365 admin center | Microsoft Learn
If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
I look forward to continuing the conversation.
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