Here you should follow the steps for How To Deactivate Cash App account

You must log in to the app to close your financial app account. Download the payment report from your account. If you are thinking about money now, expect it to stabilize. If all payments have been made, go to “Account and Settings Choose “Personal information” You will then see the "deactivate" option. Then click on “Continue”. After verification, click on “Confirm”.https://www.contact-mailsupport.com/blog/how-do-i-get-rid-of-cash-app/