Problems with changing the default country in Google Play Store I need help regarding changing my country on the Google Play Store. I tried everything from hard resetting my phone to changing all the details in the settings but it didn't work. I changed all my Google Wallet details to the US address, even added a US-based payment method, set the US address and payment method as default, then I tried clearing the cache, purchasing an app using the new payment method. I even did another hard reset, but unfortunately for me, nothing has worked so far.

I would be really grateful if you guys could offer me some help regarding this problem.

Please don't redirect me here: How do I change the Google Play country?

I tried that already but doesn't work for me.

Unfortunately I also can't root my device (Xperia Z Ultra) since root is not yet available for it and I am using a Mac.
unfortunately you can't do it in google play.but can login to your google account, and there you click on edit next to your email id and here you can see the option to edit information in the country field. Now you can change your country whatever you want.
but if this won't help you and want to access the playstore apps that have a country restriction, you can use apps like Hideman hideman VPN playstore link  to access play store apps via their servers at USA and you can actually download them.