Manually doing the /boot partition should never need more than the present 2G that is created automatically by f44 installs. If you choose to make it larger then probably a cap at 5G should be acceptable to avoid wasting excessive space.
I’d recommend a large ESP (something like 5GB) because within the next 100 years there will be a time where UKI kernels will be fashion and they reside on your ESP, not your /boot.
Also, I would recommend to switch the “RHEL Forever”, just make sure your kids inherit your forever license.