Is magic really possible. If possible is there any way to change gender of a person?
Magic is intrinsically found, in my opinion. I cannot tell you if it is real or unreal. You would have to find that on your own, and I encourage you to do so. Explore, experiment, and document your results. Tell me your findings if you'd like, and I might tell you mine. But what matters is that you find your own truth. Do not let it be spoon fed to you.
As for gender, science would be where I'd point a person trying to change their assigned gender. Go to doctors, therapists, any medical professional really, and go over your options. There are more options now than there were before, and the professionals these days are better equipped to support someone during a transition.
I hope this was helpful! Thank you for the ask!