Defect caused by parking rempler, bumper lining driver’s side

Hello, the plastic covering of my bumper was damaged by a parking ramper on the driver’s side of my space star year 2017 and has detached itself from the body (see photos). Since I don’t know exactly how to bring it back to its original state, I hope that one of you will help me. I’m afraid that plastic parts may break off if I try to repair this damage with brutal force. I need your help and expert support. Best regards David