I’ve seen people cut it off and add an off road looking bumper that wraps around that section some. There is someone that makes fiberglass bed replacements for them. Last I checked it ran a couple grand for one.
If you can find a used bed somewhere that’s in better condition to swap it out or find one that has damage in other places that you can use the spots you need as a donor like B-man said.
You can try to bend/shape and weld on a piece of sheet metal if you’re good with that sort of thing.