For frustrated folks like myself who are also lazy like myself:

How to deactivate: https://help.doordash.com/consumers/s/article/How-to-deactiv...

Where to deactivate: https://help.doordash.com/consumers/s/contactsupport?languag...

*for what its worth, deactivation and deletion are mostly semantics if the point is to send a message to a company that their mismanagement erodes trust with users. "churn" is a metric that very much matters to executives and "deactivation" impacts that.