As a cash app user, you must know that how important to unlock a cash app account because until and unless you will not recover your cash app account you will be unable to use its services. Make sure you should have to wait 48 to 72 hours to unlock your cash app account.
https://www.supporttechhelp.com/blog/unlock-cash-app-account/

There can be multiple reasons behind the cash app won't let me send money these reasons are users do not have enough balance in their account, they may enter incorrect information, they are not using updated versions of the cash app, and many more reasons.
https://www.supporttechhelp.com/blog/cash-app-wont-let-me-send-money/