What is my current region?

If you click on the related article above, to which ghr165 is referring to, you can find the information for your currently registered region for your Apple ID, using your iPhone or the Music/iTunes app on your computer.

...

...

...

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

Is there something in the article that you don’t understand?

Tapping in step 4 should show you one country with a tick. You do not have to change the country or region.