23 years old - Is there a way to restore some of the fullness/plumpness to my face again? Is fat grafting my best bet?

Hello and thank you for your question. Buccal fat pad reduction has become a popular procedure for slimming of the face, however as you have mentioned, it can cause hollowing of the cheek area. Once the buccal fat pad has been removed, it cannot be exactly restored, however volume restoration in the face can be achieved through a variety of techniques. Fat pads of the face are complex and recontouring the area can be performed by an experienced provider following a thorough in person evaluation. I recommend that you review your concerns with your provider to determine the treatment option that would be right for you.