I have a rectangle shaped face and want a heart shaped face (Photo)

This is a great question. Based on the picture, you may be a candidate for a little more cheek filler or bio-stimulators (sculptra or radiesse) to your midface and cheeks to widen your mid-face a little more. I am not sure how much cheek filler you had injected or how long ago, but based on your facial profile, a little more volume in your mid-face would help the overall appearance and widen and open up your face. Your hair is covering the temple areas on both sides, but you may also be a candidate for filler or biostimulators there also. This will help accentuate your facial harmony and achieve the desired heart shape. I hope this helps!

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in-person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.

Filler over time drifts south in our faces over time. It persists possibly forever. Over time, as the filler ages, it hold more water making our faces look boxy. Removing this material and adding back a little under the eye will make you look so much more youthful.

If you have limited muscle to feel along the masseter, then botulinum there is not likely to satisfactorily change the shape of your face.
You have a large mandible (jaw bone). I address that regularly with a 1 hour procedure that reshapes the bone to a more narrow shape. It's sometimes called v-line surgery.
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If your provider did not feel that you have large masseter muscles then Botox will not help as the treatment shrinks the appearance of the muscle. You can't shrink what isn't there. You may need to consider surgical interventions if the face contour is more primarily related to the nature of the jawbone.

Someone like you who does not like having a long face, can easily change it with a use of your own fat. When proper fat is used in the hands of an experienced, fat, grafting Plastic surgeon, the result should be extremely natural and practically permanent. You can create almost any shape of the face, you desire with fat, you simply need to present that look you desire to achieve. I hope this helps and good luck from New York City Plastic Surgery.