Unfortunately there isn't much you are going to be able to do.
To install a longer awning you'd need more room towards the front of your vehicle to mount the arms/bracket. It looks like yours is already as far forward as possible.
Short of rigging some sort of auxiliary, stationary awning that would clamp to the arm, (which you would have to install and remove every time you opened/closed the awning) I think you are stuck with what you have.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel
Ford F-Series SCREW 4x4
TST Tire Monitor - Sinemate 3500w Gen.
2016 Nights Camped = 46