my old iPhone has a cracked screen and a broken led screen so I am unable to unpair my watch. is there a way to delete my watch entirely from the old phone and start over?

Unpair Apple Watch without iPhone

1. Put your Apple Watch on its charger.
2. Press and hold the side button as if you were going to power it down.
3. Do a firm press on the POWER OFF slider and let go.
4. Tap Erase all content and settings.

Completely unacceptable answer. Problem should not require erasing anything but the files associated with the phone.

You could’ve backuped your iPhone before doing the thing that broke the screen.