In general, the U-shaped striker bolt has a wide range of adjustment, both vertically and horizontally. By sliding the striker bolt inward [toward the center of the car], you can adjust the postion of the latched door.

Get yourself a large phillips-head screwdriver and loosen the two machine bolts...just enough to slide the striker bolt inward an 1/8th of an inch or so. Retighten the bolts and check the adjustment.

Fine tune as needed so that the face of the door is roughly flush with the body. The door latch should "catch" without the need to compress the door against the frame.