how to use eapi 8 and install the latest packages in Gentoo

[rupeshforu3]

Hi I am Rupesh and I am from India and I brought a new system with AMD Ryzen zen3 5500GT and Asus prime b450 motherboard. I installed Gentoo Linux on my system and it is working fine but I can't install the latest version of packages.

With your valuable suggestions I have installed Gentoo Linux on my system but I have not modified the configuration files related to portage and so I think that newer version of packages are not installed.

The latest version of zen kernel is 6.12.1 which is in eapi 8 repository. But I have installed Zen kernel 6.10 40 days back. At present when I search for the word kernel using the following command

emerge -S kernel

I got result as

Zen kernel
Installed version 6.10
Available version 6.10

I think that that at present my system is using eapi 6 or eapi 7.

Kindly try to suggest how to use eapi 8 as default so that I can install latest version of packages.

Also can you say whether it is needed to install Gentoo Linux from the beginning.
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Regards,
Rupesh.