Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
You need to cancel your subscription: Please go to https://account.live.com
Sign into your Microsoft account. Then go to Subscriptions. Click on Manage for the subscription plan you want to cancel.
Then have your husband share with your Microsoft account/send invitation to your microsoft account https://support.microsoft.com/en-us/office/share-your-microsoft-365-family-or-premium-subscription-b389b9ce-3ae3-4a82-9017-39d79972fcba
Make sure he sends the invitation to the same Microsoft account of yours that used to have the personal plan. This will ensure that your files are not impacted.
On your apps like Word, Excel, you might see license expired. Don't worry. Just go to Files > Accounts, Update license and log in again.