What if i tell you that i have magic green coffee beans that can completely eliminate your public speaking fears? In fact, if you buy and eat these, you will be the best speaker in the world! Would you like to buy them now?
The truth is that there are no beans that can make you a great speaker instantly. Yet in every single field of human development, there are always people trying to sell some gimmicks only to take your eye off of what you really need to do. If you need to lose weight, chances are you need to exercise more and eat fewer calories instead of worrying about magic green beans. If you want to become a better public speaker, you need to stay away from the people who are out there telling you to use snake oil, tap your face, visualize your audience naked, or holding he wonder woman pose in the mirror. These are merely tactics to take your eyes off of what is really needed to be done.
Similar to how you need to eat healthier if you want to be thinner, in order to become a better speaker, you have to do something that actually works. It might not be as fun but it is the only thing that will get you a result. You need to practice speech on video and look at it to figure out where you lack. If you think you sound boring, then you must change. And there is no magic pill that can help you do that.