Hello, Hardev00222. To recover your Gmail account, you will need to reach out to Google for assistance. They are the ones who can help you regain access.
If you were referring to the email address associated with your QuickBooks account, you can refer to this guide for additional help: Recover your Intuit Account if you can’t sign in.
Once you've successfully recovered your account, please remember to update your information in your QuickBooks Online account.
Feel free to click the Reply button if you have any further questions or concerns. The Community is always here to support you!