Perhaps send a screenshot of that installation step. When you come to disk partitioning you need to select the partition you want to erase and install or replace eos with.
I would rather follow a simpler route…
Instead of complete reinstall, what you can try now is boot into live iso, open a terminal and chroot with your live iso then reinstall the kernel via command line. There are plenty of guides in this forum that explain chroot. It is worth to understand how this works if you use an arch based system.
Here is a guide from wiki.
https://discovery.endeavouros.com/system-rescue/arch-chroot-for-efi-uefi-systems/2021/03/
Then you reinstall properly the kernel, here commands I posted above:
Then reboot.