If you have registered another recovery method, such as an email, you can recover your Gmail account.
To get started, visit this page : https://accounts.google.com/signin/recovery
Enter your Gmail email address, click on "Next" and enter the last password you remember. Then, choose your recovery email to get a verification code.
If you have not registered another recovery method, click on "Try another way", and answer Google's questions to try to recover your account.