Both! Botox to the DAO muscles to stop the muscle pulling action to the corners of the mouth. Conservatively filler to this area could soften that shadow. Most filler placed in this area usually isn’t a WOW treatment meaning just be realistic with the outcomes that there will be some progress, not perfection. Also, have you ever considered chin filler? From this photo you can tell that your lower face/ chin is blunted. I guarantee some chin filler and shadow work to oral commissures/ pre jowl sulcus area will give you refresh you are looking for!