Cannot upgrade to iCloud+

Hi medjelezo

welcome to the Apple (user-to-user) Community!

If you have recently moved to another country, you may need to change your Apple ID Account to that country: Eg: In the linked article below:

Check through: ”What to do before you change your country or region" for anything that applies

See how to: Change your Apple ID country or region - Apple Support

Then scroll down to: "Use your Mac (or Windows PC) to change your region": and follow the steps.

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Re: Cannot upgrade to iCloud+

Wondering just where you have been trying ...

You may want to check you are signed in (to your Mac) with your correct Apple ID:

How to: Sign in with your Apple ID - Apple Support

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If you need a payment method for iCloud+ in your Apple ID Account:

Check which Payment methods that you can use with your Apple ID - Apple Support in your country

How to Add an Apple ID Payment method: Add a payment method to your Apple ID - Apple Support

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Manage your iCloud+ subscription on your Mac

1. On your Mac,

• • macOS 13 or later: Choose Apple menu  > System Settings, click [your name] at the top of the sidebar, then click iCloud.

1. Click Manage.
2. Click Change Storage Plan or Add Storage, then :

• • Upgrade: Choose the amount of storage you want, click Subscribe to iCloud+ or Next, then follow the onscreen instructions.

Above is from: Upgrade to iCloud+ and manage your subscription - Apple Support

All the best :-)