Prolly the lower hinge if its sagging.
Easiest way to tell is to open the door and pick up on it. Youll see which hing has play in it. Easy to change. Just remove the kick panel, reach up in there and remove the nuts and unplug the harness, remove the door, remove hinge, put your new one one, just get it slightly snug, put it back on the car, put the nuts on slightly snug, then adjust. Should take about 15min with a general idea of what ur doing.