A couple of microdroplets of Botox (or other neuromodulator, such as Dysport or Xeomin), should help to elevate and reposition the tail of the eyebrow and result in greater symmetry between the left and right brows If additional elevation is needed an appropriate filler can be placed in the region to further support the brow. For noninvasive treatments of the ptotic eyelid, a recently approved, prescription eye drops, Upneeq, would be worth an appropriate trial. The benefits of this are typically seen after the first application. Make sure to consult a board certified cosmetic dermatologist. In experienced hands the Botox/filler treatment should take no more than five minutes or so to perform. Best of luck.