If you forget your Cash App PIN, you can retrieve it by following these steps:

1. Tap the profile icon on your Cash App home screen.
2. Select Personal.
3. Select Cash.
4. Enter the amount of money you want to withdraw and tap Cash Out.
5. Tap Confirm.
6. Tap Forgot PIN?
7. Enter the last four digits of your SSN and tap Continue.
8. Tap OK when prompted.
9. Enter your new Cash App PIN and tap Continue.
10. Tap Done.

https://cashapphone.com/blog/cash-app-pin