Bumper Sag- what’s this part?

Hello! New passport owner here. I have a 2019 Passport elite. There is a bit of damage to the rear unpainted number near the reverse light- not bothered too much by that- but the rear bumper on the drivers side also sags ever so slightly. I took my bumper off to take a look at the issue (and repair my kick sensor) to find this little black bracket that is a bit loose. It has white clips with a Philip’s head pattern and I’m not really sure what they are or how they work. Any help would be appreciated so I can get the bumper lifted back up.