I cannot change country in appstore

You have not mentioned the difficulty face by you in the process.

Use your iPhone, iPad, or iPod touch to change your region

1. Open the Settings app.
2. Tap your name, then tap Media & Purchases.
3. Tap View Account. ... 
4. Tap Country/Region.
5. Tap Change Country or Region.
6. Tap your new country or region, then review the Terms & Conditions.

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Change your Apple ID country or region - Apple Support

Do you have remaining money balance in your current country? If so, then you have to finish that first and drop it to 0.