How do I change the primary account holder?

Hey _amyy12,

To change the Family Sharing Organizer you would need to disband the current group and have the new organizer create a new Family Sharing group: Leave or remove a member from a Family Sharing group on iPhone - Apple Support

Disband a Family Sharing group

When the family organizer turns off Family Sharing, all family members are removed from the group at the same time. When a Family Sharing group is disbanded, all members immediately lose access to the shared content and subscriptions.

Note: If a child is in the Family Sharing group, the organizer must move them to another group or delete their Apple ID before disbanding the group. See the Apple Support article Move a child to another group using Family Sharing.

1. Go to Settings  > [your name] > Family Sharing > [your name].

2. Tap Stop Using Family Sharing.

Here's more information on Apple Music family subscriptions too: Get an Apple Music family subscription - Apple Support

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Take care!