Hello 21 year old female š
I would suggest a scar revision - cut out the scar and stitch it again as meticulously as possible to reduce the risk of it widening again.
To address the depression, various techniques can be used either during the scar revision or after as a second stage procedure. Sorry that this sounds a little vague but this is the beauty of plastic surgery - we like to use a wide repertoire of skills coupled with some imagination and creativity to solve your problems
Best to consult your plastic surgeon and discuss the pros and cons of each option
For problems like these, after consulting the patient, I usually write to the patient's insurance company to explain the treatment plan. Often, these surgeries are insurance and Medisave claimable.