Recover deleted user Files from guest account

Recover deleted user Files from guest account

I had installed Gmail, and that had created a lot of users on the login
screen. So I decided to delete them. But as I deleted them, I lost my user
account. Now when I login there's only guest login option.
Hence I have to recover my files that were in the user account.I know
e2undel but how can I do it (install and execute from the guest account)
when I don't know the password of the root.