On the other hand, if you have not used your Gmail account for over 30 days, it may have been deleted. You must then create a new one, insuring that you note your password and security question and store it a safe place, remembering where the safe place is.
Even you can easily recover your password with following details
secondary e-mail address
security questions, etc.
once you click on forgot password option , it will ask your last password or phone number which you mentioned while creating account. So you should provide the required details and they will send you a link.