No difference after endoscopic brow lift. The Dr said my muscle was too taut - she pulled as high as she could? (Photos)

You likely have fairly tight skin and muscle but I am not certain that is the reason for little change from your brow lift procedure.  There is a structure below the level of the eyebrow that is called the arcus marginalis.  If this tissue is not released and the transected along with the conjoint tendon of the temporalis muscle,  then you will not get appropriate brow elevation.  I suspect that this procedure was performed endoscopically but that should have been able to elevate the brows a decent amount and your surgeon was too conservative in their release.  I would advise against a direct brow lift procedure at this time.  Revision endoscopically in experienced hands can remedy this situation.  

Failure of, or short-lived results in Brow-lift surgery are usually related to an inadequate release of the soft tissues away from the bone before the new position is fixed. There are strong forces at play that determine a low position of the brow. Gravity is one. It will win every time unless there is extensive release of all the attachments of the muscles and soft tissue from the bone. This includes ligaments that 'weld' the soft tissues to the underlying bone. This is what a surgeon pulls against during the surgery when they are trying to 'pull' your brow into an elevated position. 
These attachments are in defined positions around the eye and down onto the outer part of the cheek bones. Unless these are properly released during the procedure there is little hope in holding the position long term.

Thank you for your question. Endoscopic brow lifting procedures would be helpful for patients seeking more youthful outcomes. As others have mentioned, you would benefit from trying other options before exploring surgical solutions. I suggest that you move forward and consult with a board certified facial plastic surgeon.
Best wishes,