To find all of your Gmail accounts, you can follow these steps:
Go to the Google Sign-In page (https://accounts.google.com/signin).
Enter the email address or phone number associated with your Google account and click "Next".
On the next page, click on the "Forgot email?" link located below the email address field.
Enter the recovery email address or phone number associated with your account and click "Next". If you don't remember this information, you can click on "Find my account" and follow the instructions to recover your account.
Google will now show you a list of all the email addresses associated with your account recovery information.
If you have trouble accessing any of your Gmail accounts, you can click on the "Need Help?" link on the Google Sign-In page for further assistance.
Note that if you have multiple Gmail accounts, you can also use the "Add account" feature to switch between them without having to sign out and sign back in again. To do this, simply click on your profile picture in the top right corner of any Google page and select "Add account".