How to find out what my screen time password is?
How to I find out what my screen time password is if I’ve forgotten
[Re-Titled by Moderator]
Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support
If you can't remember a restrictions passcode that you set on a previous version of iOS, or you forgot your Screen Time passcode, you need to erase your device, then set it up as a new device to remove the passcode. Restoring your device from a backup won't remove your passcode.