Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
If you do not need the Microsoft 365 subscription based Office licence, you can use the free Office apps in a web browser on these links, try those apps to check if they suit your needs.
Word:
https://www.microsoft.com/microsoft-365/word
Excel:
https://www.microsoft.com/microsoft-365/excel
PowerPoint:
https://www.microsoft.com/microsoft-365/powerpoint
2
If those free online apps suit your needs you can cancel the Microsoft 365 subscription, log into your Microsoft account on this link:
https://account.microsoft.com/services/
Then, beside the subscription, click the Manage button, in there you can cancel the subscription, and also ensure you disable the recurring billing on the subscription to avoid any further charges.