If you want to delete your account entirely from Expo Pass, you can easily do so via the Mobile App.
When you are logged into the Mobile App, click the hamburger menu in the upper left-hand corner and then click on your name.
You will now be on "YOUR PROFILE" and you will note the red "Delete Account" button.
Once you click it, you will be prompted to click "Continue" and then "Delete."
Please note that once you have deleted your account, it cannot be restored. Instead, you will need to create a new account.