What can be done to correct my vermillion border/cupid’s bow area/lip line to make it symmetrical to the other side? (photos)

You need to be patient, as it is very early after the treatment. It is not unusual to repeat such a procedure several times, before having a satisfactory outcome. Alternatives are Lip-implant (feels odd, especially since you will only need it on one side). Implantation of Fascia into your lip.
Non-Surgical alternatives include injection of fillers, and medical tattooing. The latter will be able to create the a vermilion border that will by symmetrical to your healthy side. 
In case you find it difficult to find an experienced medical tattoo center, you might consider contacting breast reconstruction centres in your area. Very often do these centres work with a medical tattooist that helps reconstructing a natural appearing areola.
Greg Bran MD PhD
Double board-certified Facial Plastic Surgeon