First try to lean harder with your feet. If there's still no luck, take a skate tool and loosen up your trucks. It will be a little harder for you to balance when you loosen the trucks but easier to turn.
But left foot near the middle, your right foot and the back (nose) put all your most of your weight on the back foot and just shift your body, you may need to loosen trucks
Keep practicing and loosen up your trucks abit more. You can try putting your back foot on the tail and then softly press down and turn.
Lean on your toes , and Lean on your heels . Maybe your trucks are tight . Loosen them up .