CHROOT AND INSTALL GRUB2
1) mkdir /mnt/sda1
2) mount /dev/sda1 /mnt/sda1 < i.e. mount the install partition
3) mount -t proc proc /mnt/sda1/proc
4) mount -o bind /sys /mnt/sda1/sys 
5) mount --bind /dev /mnt/sda1/dev
6) chroot /mnt/sda1 /bin/bash < i.e. "chroot" to the install partition

7) grub2-install /dev/sda

8) grub2-mkconfig -o /boot/grub2/grub.cfg

Regenerate a new initramfs for a running kernel

Command: dracut -f initramfs-$(uname -r).img $(uname -r)

Building an initramfs for a specific kernel version - see 
https://linuxconfig.org/how-to-build-an-initramfs-using-dracut-on-linux

The easiest way to build an initramfs for a specific kernel version is to invoke dracut with the --kver option, and provide the kernel version the initramfs should be built for as argument as this example:

$ sudo dracut --kver 6.5.3-1.el9.elrepo.x86_64

Then check /boot/loader/entries/7f995a0fe43f460eb2bd9ed103630601-6.5.3-1.el9.elrepo.x86_64.conf for the correct 
UUID for the install partition and SWAP
Change if necessary.