Just so you know, "move to Europe" is pretty complicated inside Apple ecosystem. You can't move your App Store account from one country to another while you have any subscriptions active. You cancel them, wait for them to expire, and only then you can switch. So, for example, if you subscribed to an app yearly in January, and then cancelled your subscription in May, you still have to wait until January of next year. Very annoying in practice.

It's easier if you create a new apple ID which you use for the EU, separate from your existing one, and then login to the phone with your old Apple ID, and login to the app store specifically with the new one.

As a bonus, you can then re-buy all your apps if you want to not have to sometimes toggle between the old / new one to re-download already purchased apps.

Frankly, I'm surprised apple doesn't hard-require you to re-purchase all your apps when you switch regions, it would be a lot more apple-like.