Recursos do Microsoft 365 que ajudam os usuários a gerenciar suas assinaturas, configurações de conta e informações de cobrança.
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You will not be able to simply switch from family to personal plan.
You will have to cancel it first. 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.
If it was subscribed during the last 30 days, you can contact support and ask for a refund. Otherwise you will have to wait til it expires. Then sign up for the personal plan.
As long as you sign up with the same Microsoft account right after it expires, your files are there and there will not be any file loss, no need to backup either.
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In case you need to get to billing support, Go to https://support.microsoft.com/contactus, Type "Billing" and press Enter. On the next screen, click "Contact support" at the bottom of the page, then choose "Microsoft 365" > "Manage my subscription". You’ll then see the option to chat with a Microsoft support agent who has access to your account to help review the issue.