I’m sure you could have fixed it with GRUB Rescue. It’s slightly annoying, but it isn’t that hard to get booted from that. Once you get it to boot then you can fix things.

Don’t give up so quickly next time. It’s useful to learn how to fix it instead of just accepting failure and resetting everything.

Yeah, man, I even went into live mode to try to undo what I did, but I still couldn’t manage it (I should have looked for help). But since I have backups of everything and my dotfiles, I didn’t worry too much (though I was pissed, I won’t lie).