Is it possible for me to go from a 36C to a 36A? (Photo)

Your breasts are too low on the chest wall and asymmetrical in volume, shape and position.  The technique I recommend is a lift using The Bellesoma Method.  This will reshape your breast tissue creating upper pole fullness without implants, elevate them higher on the chest wall and more medial to increase your cleavage.  The weight of the breast is transferred to the underlying pectoralis major muscle resulting in pain relief and long term stability.  Vertical scars are avoided, nipple sensation (in 95%) and the ability to breast feed are maintained.  The areolas can be reduced to the size you desire.  Best Wishes,Gary Horndeski, M.D.

Hi, thank you for sharing your question. 
You are a good candidate for a breast reduction especially if you are experiencing symptoms or simply prefer smaller breasts. The amount of reduction can be tailored to your specific wishes, but an exact bra size is difficult to guarantee. An in person evaluation is always best to determine the optimal type of procedure, but in your situation, a lollipop incision would work. 
Consult with a board certified plastic surgeon to review all your options. I hope this helps. Best of luck!