On your device, visit Google’s account recovery web page and enter your email address.
Google will require you to enter the last password you remember using with that Google account. If you don’t remember or are unsure,
simply, click the hyperlink embedded in the words, “try another way” at the bottom of the screen.
This is where the phone number you signed up with comes in handy. Google will send a verification code to it and you can choose to receive it via call or text.
After receiving the verification code, enter it into the query box on Google’s Account Recovery Page and click Next.
You’ll be asked to reset your password, after which you’ll have access to your Gmail account like usual.
However, if you don’t have a phone number connected to your Gmail, click try another way to sign in and follow the steps given.