Change my email back to the one I deactivated.
Some time ago I deactivated my account because I was too busy for Duolingo. Now I want to go back to learning again but I have to use another email. I would like to go back to my original email, is it possible?
(The lesson I learned: never deactivate Duolingo, ever...)
Deactivating your account doesn't make it inaccessible forever. If you want to get the old account back, simply sign into the account again (I think). Even if you don't want the old account back, you can sign into it, go to Settings and change the email. Then you can go back to the different account and change it to the old account's email, if you wish.