My Server is down with error: file '/boot/grub/i386-pc/normal.mod' not found.

When I try to launch the console from panel I get this error: file ‘boot/grub/i386-pc/normal.mod’ not found. And prompt of “grub rescue” comes. I have no idea how to resolve this issue. Here is what I have tried so far:

1. Tried contacting support but no satisfactory answer. they gave me 2 link as below, I tried and couldn’t find anything. https://unix.stackexchange.com/questions/70538/grub-error-file-grub-i386-pc-normal-mod-not-found https://askubuntu.com/questions/266429/error-file-grub-i386-pc-normal-mod-not-found

2. The above links suggested to change the prefix I tried, but it didn’t worked, here is the output of ls. grub rescue> ls (hd0,gpt1)/boot ./ …/ efi/ grub rescue> ls (hd0,gpt1)/boot/efi ./ …/ NO FILES/FOLDER inside efi folder and there no grub folder as well. So I think grub is removed. And I have no idea why/how.

SOME INFO ON WHY & HOW PROBLEM STARTED:

1. I was having issues in accessing the SSH and SFTP it was giving the access denied error. I contacted support and they suggested to do a root password reset from DO panel. I did. And that was the disastrous step. After that server RAM usage is at 60%+ and I am not able to access anything. I tried the root password reset again. Password changed server restarted and we are back to zero.
2. I tried turning off the server and turn back on. Again no change.

Please help me out. Everything is down.