Google accounts' region cannot be changed by the user. Google's backend will choose your location based on your current position.
Before starting, first modify your address in the store to the desired region and turn off browser or app location permissions.
Open https://policies.google.com/country-association-form
I was located in Hong Kong, but I rarely use the node there.
Select the region.
For desktop users, it is recommended to use Location Guard plugin.
Then just wait for a bath and lay down.