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I do not know if you are just starting or have tried for years to make a profit out of your work.
I will assume that you are just starting. First, build a thick skin and believe in your gut talent and inspiration. Your inspiration is your uniqueness. The viewers are more likely not prepared to grasp your perspective and style. Not yet. Read the biographies of artists if you do not already do so. Rodin, for instance, found that he had to learn the skill necessary for a small task in order to move on to a larger more ambitious task. Perhaps that needs to be your approach too. If you continue to develop your skills as well as listen to your inspiration, your path will unfold in front of you.
Try different profit making venues, but focus on one of them at a time because it takes time and effort to learn what each venue requires and values. Otherwise you will spread yourself too thin.
As a person who loves comics and cartoon artwork, don't listen to what your professionals say! I would say take any classes related to drawing, art in general. Doing that allows you to build your passion for drawing and your skills with confidence. Within these classes, I would say start auction your artwork to family and friends, hopefully to school and from there, take it to stores and communities in need of your talent. I hope this help give you an idea on how to start!