Buy a power splitter
Buy a ir led light unit (cheap as is the splitter)
Use a piece of electrical tape
The tape is to block part of the ir light your camera is using that is hitting the wall. Might be easier to move the section your camera sees a bit away from the wall.
This will decrease the problem and increase the area you can see.
Or after blocking the needed ir bulbs on your camera, to stop the whiteout problem.
Then put the splitter between the power cord and camera.
Connect the new ir light unit and install on the other side of the camera (away from the wall side of camera),
This will give you more ir light and greatly increase what you can see.
One catch…the ir light come in increasing numbers of light units example, but also takes more power!