Tell us to delete your account
First, please let us know to delete your account. The easiest way to do so is to send us an email to firstname.lastname@example.org. Please do mention your account email if you are sending the email from an account that is not your Sheetgo account email.
We will inform you once your account has been deleted.
Remove the add-on sidebar (optional)
In case you have installed and used the add-on sidebar, please open any Google Sheet and go to Add-ons > Manage add-ons and from there remove Sheetgo.
Revoke all permissions
Lastly, completely disconnect Sheetgo from your Google Account. Go to myaccount.google.com/permissions and search for any mentions of Sheetgo. Click on remove access to revoke the permissions.
If you have followed these steps, your account has been completely deleted.
Good luck on your further endeavour! :-)