How can I change my region on Apple Music?

The region for Apple Music must be the same as the region for your Apple ID (billing address) and the region for the iTunes Store and App Store.

If the region got changed unintentionally, and you want to change it back, then sign out for the iTunes Store and App Store, then sign in again.

Changing the region for your Apple ID intentionally has consequences for past purchases, as they may not be accessible in the new region. Changing the region for your Apple ID also interrupts any subscription through iTunes. Changing the region for your Apple ID also may require different payment methods for that other region.

Read through this on what to do before switching and the consequences of doing so.

Change your Apple ID country or region

https://support.apple.com/en-ca/HT201389

Don’t do this unless you are moving to the new region. Resist the urge to switch just because you fancy a song or app from the other region.