Had a BBL and my butt is to big for my legs. I want to get a revision. (photo)

You could consider conservative liposuction to the buttocks.  This is a procedure that requires skill to prevent loose skin or irregularities.

Ideal candidates are at a stable weight,  in good health , and have excess fat in some parts of the body and too little in other regions.  Gaining weight before the procedure is to no advantage and when you lose weight again the fat cells will shrink just like the donor site fat cells.  Typically, the transferred fat results in a significant increase in volume of the body site being treated.