From the photos, the main issue appears to be implant position and lower-pole skin stretch, with some asymmetry. That can look like bottoming out or a stretched implant pocket rather than simply an implant that needs to be changed. If the implant pocket has widened or dropped, exchanging the implants alone may not correct the shape and could allow the same problem to recur. A breast lift is usually considered when the nipple and breast tissue have dropped too low on the breast mound. In your photos, the nipple position is an important part of the decision, but it is hard to judge perfectly without an exam and measurements. If the nipple is at or below the fold, a lift may be needed for the best shape. If the nipple is still in a reasonable position but the implant pocket is low or loose, pocket repair, capsulorrhaphy, and sometimes internal support may be more important than a lift. New implants may be part of the revision if you want a different size or profile, or if the current implants need to be changed, but they are not usually the whole solution for progressive shape change. An in-person revision consultation should assess implant position, capsule, skin quality, nipple-to-fold distance, and whether a lift, pocket repair, implant exchange, or a combination would give the most stable result.