I am currently using EndeavourOS as my daily system, everything is quite well except when I typed in the wrong password for disk encryption, I got sent to GRUB rescue menu, where I know “ls” works and that’s it.
Is it possible to make GRUB prompt for password input again without physically pressing power button?
@axzxc1236 Hello and welcome to EnOS!
Sorry I can’t help you with your issue, just wanted to welcome you to the community. 
Not sure, I’m not using encryption.
But you can reboot by running:
systemctl reboot
Yes, it’s possible. See this post.
I personally just ctrl-alt-delete to enforce a soft restart though, 
.