I write BL's, fiction and non-fiction. My published KDP book Bottom's eternal suffering   Amazon US:
https://www.amazon.com/dp/B0DB5V8R7N To countries where it isn't available,  Go to the Link of US(or UK) site and login with Amazon native account. Go to your Amazon Profile, go to this steps Account Devices (it is under Account settings) Preferences ( next to device) -> change your country setting to US/UK. Add address for selected foreign country (you can check on Google) purchase the ebook. after buying and download, you can change it back to Native country.