How do I get my account back if I know the password and username but not the email?

I don’t know if this is a new update of wtv but now i have to know the email to the acc i logged out of even though i already know the password and username. The thing is tho that i do not remember the email at all like tiktok shows me some of the letters and its a 5 letter word and then the @gmail.com at the end. But when i tried to guess the email and log it into google, it said it was too short and has to be longer than 6 characters.

I want to get the account back bc some of the things i posted i cringe at so bad. But it genuinely seems like i just can’t anymore.