how i can restore my appleid (icloud) password? i forgot it

I have iphone 8plus and i forgot the passcode from lock screen. i tried many times and after last try i get message like "Your iphone is locked". after that i try to restore my iphone via notebook and itunes app using recovery mode. But after finishing iphone recovery i got `Activation Lock` screen, but i forget the icloud email password. how can I prove that this is my phone and my icloud? i have access to my phone number and also i have phone box with license codes.