You can assign another user as the Account Owner. You will need to invite them to Surveyapp first. To do this, visit: https://app.surveyapp.io/account/users
Click the Invite New User button and enter their details. Click Send Invite to send them the Surveyapp invitation email.
Once they have activated their account and signed up, you will be able to assign them as the Account Owner.
To do this, toggle the Make Account Owner? switch and then save your changes.