I have a student with the same situation. Without a club, get into your address position. Turn or rotate your trunk, torso to the right as if you're making a backswing, keeping your shoulders LEVEL. 80-90% of your weight should be on your right foot. Now turn to a full finish with your stomach pointing toward your target, 90-95% of your weight on your left foot and the tip of your right toe.
Also, you can get into your address position without a club and turn as if you are shaking hands with someone on your target line behind you. Your shoulders will be level and your weight will transfer to your right foot. Then turn to a full finish described above.
You can look in a mirror at home and do both of these drills. Pick out a spot on the mirror - or make one. Stand so that spot is on your forehead or just above your head. As you make your backswing, your head should not drop below that mark.
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