how to change my email back to what it was originally


New Email
hey, I recently changed my email as it was very long and often embarrassing to reproduce when someone asked me for my email. The other day I found an option on outlook to change the email address, which I did, changing to something much more appropriate. However, now I am no longer able to receive any emails from my old account, which is a problem because I have many important accounts connected to that email. My old email is listed as a alias, but I can only remove it, I am not able to change it to my primary alias. What do I do??