Tractor cannot be pushed

Hello, I have a problem with a tractor Deutz D25. I want to push the tractor only about 5 meters. Unfortunately, it can only be moved as far as with a car where the handbrake is tightened. I take the handbrake is the bar which is circled in. (Presses down at least on the right pedal) It can not be moved no matter how I adjust it unfortunately. I can not drive it away because the battery is empty. So a tractor has to be moved anyway? What do ic Thank you very much.