Gmail — my secondary account

[protected]@gmail.com is my secondary email.. I cant log in... Into my sister's laptop cause it needs to verify my old number last digit 07 which has lost along with my old phone... I have a new number [protected] can you please add my new phone number so that i can log in back to my account... I know the password its just need verification code from my old number but i dont have that number anymore and i forgot that number... I need that email to log in my steam acc. Im stocked on this..

My primary email is luigi. [protected]@gmail.com.. Please respond asap