If your Cash App account closed, you could reactivate it by contacting customer support. Provide a brief description of why you've closed the account, and you'll receive a response from their customer support team. You can also submit your request through email.
First, you should remember that closing an account is not necessarily a bad thing. You can still use your Cash App account if you haven't made any payments in a while. However, you must ensure that you haven't made any recent payments. You might feel cheated if you've just deleted it for any reason. Luckily, it's very easy to reactivate a closed Cash App account.
To reopen closed Cash App account, you should check the previous devices you've used to access the app. If unsure, contact customer support and get a code to reactivate your account. It'll only take a few minutes, and you'll be able to get your account back online.