Shower tray repair

First time here so thanks in advance
Need help to repair my shower tray.
Sadly it has cracked.
The walls are built of top of the shower tray so removal is not an option.
I thought i might have been able to use resin but apprantly i can only do a patch repair.
I want to do something that looks nice so wanted to fully cover it.

Any ideas best way to proceed

Fill the sunken part in with putty, and the crack with Captain Tolly’s creeping crack repair. The seal it all with clear flex seal.

Couple layers of fiberglass cloth or matting……sand….paint.