Deep MRSA Scar Treatment. Anything else to be done? (Photo)

It is unfortunate that you have suffered as you described. The reason the silicone works is that it helps to retain moisture. What that tells me is that increasing volume in the are would help. I would suggest that based on your description and the photos (In person examination would be ideal!) fat grafting the scar would be beneficial.

Thank you for your question and photograph.
It's difficult to evaluate your skin through this type of forum, but from what I can, it looks like you have atrophic scarring. This type of scarring is amenable to treatments that injure the skin with subsequent collagen formation, such as fractionated laser, dermaroller, resurfacing lasers, deep peels, etc., may help your condition. Fillers are a good option, specifically Bellafill®, a permanent filler. Bellafil® is FDA approved in treating acne scars. The right modality for you depends on your skin type, expectations, patience, downtime, and cost. I highly recommend you consult with a board certified dermatologist or plastic surgeon to have your skin evaluated and to discuss treatment options that are appropriate. Take care and good luck.