Thank you for the question. Yes, generally speaking, it should be possible to exchange moderate profile breast implants to a high-profile breast implant. Ultimately, which operation you should undergo (if any) will depend mainly on your personal goals. If I were seeing you in consultation, I would ask that you communicate these goals in terms of goal photographs and/or computer imaging. Avoid the use of cup sizes as a reference point; this can be a source of confusion and miscommunication. My best advice: select your plastic surgeon carefully. Make sure that he/she has significant experience achieving the types of outcomes you will be pleased with. Then, communicate your goals carefully, as discussed above. Working together you will come up with a good plan to achieve your goals. You may find the attached link (dedicated to revision breast surgery concerns) helpful to you as you learn more. Best wishes.