Use a different email address for each region. Each region will have different games, different sale items.
Have a look here:-
Eshop
https://gameranx.com/features/id/950...pan-us-uk-etc/
Tax Free Zip Codes
https://gamingph.com/2017/04/nintend...intendo-eshop/
Pricing & Games for Different Eshops
https://eshop-prices.com/?currency=USD