Lower on the driver's side - This can be caused by weak springs front or rear (usually rear) or both front and rear, worn inner front suspension bush on the bottom arm and/or weak shocks.
To check the springs, set the car on level ground. Use a trolley jack dead centre under the front subframe to raise the car up very high. This will load the rear suspension and exagerate any weakness in the rear springs. Do the same to test the front springs by placing the jack under the diff.
Try swapping the rear shocks over side for side. The less worn and hence stiffer passenger side rear shock may be enough to lift it up sufficiently.
I did these checks on my Bro's saggy Sports Hatch last year and simply swapping one rear spring for a good 2nd hand one was all that was needed. We swapped the shocks over as well.