Recover my chat Account from deletion

This is about
After 5 months away from the chatroom, today when I tried to log in with my github account, the chat room requested me to create a new username which I named “ralts1337” while my old profile is still in the chatroom, which is axew1337( I was thinking that I created a new account thus I deleted the ralts1337( . Now it seems that my github account was somehow also linked to the new ralts1337. Both my github and google authentication are now deleted and I cannot log into this chatroom anymore.
However my mozilla account is still there. I can still log into and . Is there a way to recover my old mozilla chatroom account(or both)? or who should I email to help on this situation?
Thank you in advance.