i forgot my screen time passcode and i want to reset my iphone 7 plus, how do i do it?

If you can't remember a restrictions passcode that you set on a previous version of iOS, or you forgot your Screen Time passcode, then you need to erase your device, then set it up as a new device to ➔ How to remove the passcode. Restoring your device from a backup won't remove your passcode.

If you have updated to 13.x or iOS 14.x then follow these instructions ➔ If you forgot your Screen Time passcode - Apple Support

Axel F.