Change IP with No Leaks

Hello Tech gurus,
I am trying to apply to some online accounts for software reviews based in the U.S. Problem is, Kenyan IPs are blacklisted. I am trying to hide my IP with expressvpn and using tenta to confirm no IP leaks. I have even adjusted the time zone and configured my mozilla browser to hide internet IPs. Still, I keep failing due to geolocation when I apply.
Any ideas on how to beat the system?

Use Cyberghost premium VPN, Make Sure all cookies are cleared on your browser and your set to do it

Is there a particular way I can check for IP leaks before applying?

Use https://ipleak.net/

If you are using a WiFi expect an IP leak. Browsers tend to keep your geolocation too. Go to your browser in developer mode and check the latitudes and longitudes on it.

There are prompts that ask you if you want to receive notifications, don’t allow those.

Does this also include Mozilla Firefox? Coz I have set it to block all cookies and site data… and also set to never remember history?

What if you use rdps

Use turbo vpn

Use VPS