Iso- Facial balancing. Chin filler / implant? Masseter botox? (Photo)

I think you would like the aesthetic result of filler that could bring the chin forward. Adding filler slowly to add more protrusion without more length, can be accomplished. Botox or Dysport to the Masseter muscles will slim your lower face and elongate your face more. I do not think you need that. I would actually recommend cheek filler to give more prominence to your zygomatic arch. It would shape your face well and will compliment the chin filler.
J Scaljon

Facial sculpting and contouring of the face can be created with well-placed fillers (Voluma, Contour, Radiesse, Bellafill) and Sculptra, which would give improvement in facial balance. Fat or implants are alternatives. I recommend getting a formal evaluation with a facial sculpting expert. Best, Dr. Emer

Having a proportional sized chin and nose on side profile helps with achieving a balanced face. From your photos it appears that you may benefit from chin augmentation, either with fillers or an implant. As for masseter botox, it is best to examine whether you are a candidate for it with an in person exam.