If you already had/have a Microsoft 365 subscription and did not purchase it from the iOS app, you can manage it at: https://account.microsoft.com/services
If you purchased a Microsoft 365 Personal subscription from iOS:
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On your iOS device, go to Settings > [your name] > Subscriptions and then cancel the subscription. Your subscription will not be fully cancelled until 15 days after the date your subscription was set to renew.
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After this time has passed, go to Settings > Subscriptions to purchase a Microsoft Family subscription.