You need to find an injector with a different treatment pattern.
I am reluctant to send you back to the same doctor. Use your judgement regarding this. No one will be more motivated to help you than the original doctors. However, some practitioners are basically hopeless at problem solving.
As Dr. Persky points out, this arched brow is from an overly central treatment. The central brow comes down and the lateral brow over acts to compensate. More BOTOX can be placed to achieve a better balance.
However, if your doctor was good at...