changing region or credit card

You will have to cancel all subscriptions before you can change your country for the Apple ID.

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What to do before you change your country or region

• Spend any balance remaining on your Apple ID. If you're not sure whether you have a balance, check your Apple Account balance.
• Cancel your subscriptions and wait until the end of the subscription period. 
• Wait for any memberships, pre-orders, movie rentals, or Season Passes to complete, and wait for any pending store credit refunds to process. You can cancel a pre-order.
• Make sure that you have a payment method for your new country or region. See what payment methods you can use.
• Redownload your apps, music, movies, TV shows, and books on any devices that you might use to play or read them in the future. Some types of content might not be available in your new country or region. Learn what types of content and services are available in your new country or region.

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copied from: Change your Apple ID country or region - Apple Support

Your credit card billing address has to be registered in the same country as your Apple ID.

Yes, your iCloud Storage subscription will also be gone, since it is tied to your Apple ID and region.

But you can save all data before:

Archive or make copies of the information you store in iCloud - Apple Support

Hello ~ Take a look here as it explains well…

Changing Apple ID region impact on photos… - Apple Community

~Katana-San~