Add alternative sign in option

Have an alternative option for sign in rather than email, such as username + number, user ID, something. Just lost access to an account I had for months (work / life separation) because I forgot the email (relied on cookies to remember it).

I use the same password for everything but without the email it's no help. There's not even a "send email to j*******4@hotmail.com" option to jog the memory any.