From the same home screen where you cashed out your account, elect your Profile icon at the upper right corner of the screen. This will open your profile runner. At the bottom of the list of options, tap the Support link.
This opens the Support runner with a list of common help options. The option to close your Cash App account is not listed then, so you will need to tap Commodity Differently to continue to the coming runner of options.
The coming runner is where you will find further account options. This is also where you could also tap Cash Out to transfer your Cash App balance to your bank account if you have not formerly. Else, valve Account Settings to move on to the Account Settings runner.