Hello
for errors of the kind "Cannot write: No space left on device" the natural solution would be to enlarge the volume (.i.e. /boot) at the destination; this is done in converter wizard.
However there is also mentioned "./efi/EFI/redhat/grub.efi" in the error message (is this a single message or a concatenation of several?). Which should mean there should be another volume, mounted on /boot/efi. Perhaps it is to be enlarged too.
HTH
Plamen