Hi. I have changed from country to United States of America. Now in my information the name of the old country appears, and I am not allowed to send support.It is impossible to change the country on the platform.
Here I was waiting for “Make Cubase Great Again”…
…I want my money back.
I was going to recommend a travel agent… 
If all your licenses are on a USB key, I think the easiest way would be to create a new mySteinberg account, and register your usb key with it. Otherwise, you’ll have to contact Steinberg and request your country be changed.
Follow the resale wizard, and be both the buyer and the seller. https://www.steinberg.net/en/support/knowledgebase_new/resale_wizard_software.html