A Front Leg Raised Lunge is a really good way to work through the full range of motion of the hip while also working into the quadriceps.

Set yourself up with a raised platform for your front foot - This should be as high as one or two plates or a step to begin with. Place your front foot on the raised platform and work through your lunge as usual, paying particular attention to ensuring your knees stay over your toes.

If you feel that you still have a larger range of motion you can work through you can increase the height of your raised platform.