My right boob is so much bigger, so unhappy. How can I improve this? (Photo)

Go back to your surgeon and get another lift on the larger side and perhaps remove a small amount of breast tissue. Once lifted and the excess skin is removed, you may be similar in size.

Dear Thoughtful972341,
breast revision surgery is the most difficult plastic surgery procedure performed. Botched breast surgery alters normal tissue planes and laxity, the ability of breasts to heal properly, and leaves scar tissue that dramatically affects the level of difficulty of the corrective surgery.Many patients come in to correct poor outcomes from their initial surgeries. The most common problems are due to implant malposition, bottoming out of the implant, poor scarring, and incorrect implant size.While the type of revision required will depend on the result of the previous surgery and the desired result of the patient, some revisions involve extensive pocket repair that may or may not need specialized external bras.If you are considering breast surgery revision, you should speak with a board certified plastic surgeon and have yourself properly assessed. Only after a thorough examination you will get more information and recommendations. Also, you have to make sure that your surgeon understands your breast augmentation goals.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Breast asymmetry may be related to preoperative breast asymmetry, using different implants and gravity due to the weight of implants.
To improve asymmetry reducing the larger breast with additionally lifting should help. At times a smaller implant on the larger side to improve the asymmetry. Internal mesh "bra" supports the lower pole of the breast "lifting" and to minimize the sagging.