How to fix BBL gone wrong? (Photo

Based on one photo it isn't easy to say what happened exactly, but you do have some dimpled lower skin that could be tight.  As long as you have enough fat, a secondary procedure prioritizing the fat placement into your preferred areas is a good idea.  Now that you are more than 6 months out from the first procedure, you can go ahead as long as you don't still feel any hardness under the skin from the initial liposuction.  

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.

Dear Smagana85,it is hard to tell for sure without an examination. I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD, MHA, MS
Certified, American Board of Plastic Surgery  

Member, Am. Society of Plastic Surgery