Thanks for the question.
Unfortunately it is hard to comment without seeing a photo of yourself.
As you say, marionette lines are due to the loss of volume higher in the face leading to sagging and the deepening of this fold. Ideally this should be treated by a combination of...
Hi @andyvn579! 1 syringe is equivalent to 1 ml. I would recommend filler into the piriform fossa and nasolabial fold. Restylane Defyne and Refyne both work great to treat this area. Best of luck to you!