A thorough planned probably multiple stage revision is needed to obtain the ultimate goal. Symmetry!
I believe if you had good symmetry and the scars were placed at the very edge of the areola you could get a very good result.
With your left arm raised it is difficult to know exactly what procedure you need. With this in mind, the left breast will probably require capsulectomy (removal of the scar that has formed around the implant) with radial scoring of breast (this helps the breast tissue spread out over the implant so that it doesn't look like your breast is sitting on top of the implant) and a subglandular (under the breast, not under the muscle) silicone implant along with a periareolar mastopexy (this would not be so much for the lifting effect, as to make the areola smaller and put the scar right at the edge). This could all be done through the "periareolar" (its not really quite in the right place) incision already present.
The right breast then could be lifted to match the left breast. At least a good periareolar mastopexy is needed (again to make the areola smaller and put the scar right at the edge) and possibly a vertical incision (from the nipple down to the crease under the breast) to help tighten the lower part of the breast.
This may seem like more scarring, but when you obtain a good aesthetic result with good symmetry and place the scars in the correct locations, they are less of a concern to most patients as the good far outweighs the bad.
Most of this could be done with one operation, but touch up procedures to make small adjustments are likely. They are usually small procedures just to make adjustments or improve scars.
You still have a lot of potential for a good or even very good result so don't give up hope!