Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
There's no in-place downgrade from a more-feature plan to a fewer-feature plan. It will require caneling the family plan, wait for it to expire then subscribe the personal plan.
To cancel, please go to https://account.live.com
Sign into your Microsoft account. Then go to Services. Click on Manage for the subscription plan you want to cancel.