This is primarily directed at MtF people. This method is a temporary method and as I am FTM, I do not know how consistent it is with results. Feel free to do other research so as to get the best results possible.
Step One: Drink some ice water. It causes the vocal cords to tighten and produce a naturally higher pitch.
Step Two: Speak in your falsetto. A falsetto is a high singing range that can be reached by dmab people. If you use it to speak, you're already speaking fairly high. Just don't go so far that it sounds forced or unnatural.
Step Three: Record your voice. Play your voice back so you can hear any improvement and know what you have to work on.
Step Four: Practice. Practice makes perfect and it is difficult to train your voice. Try it out, use different methods, and find what works best for you.

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The Guide To Being Transgender
RandomHere's a list of tips and notes that can help you ease dysphoria when you're transgender. These tips can work for both out of the closet and in the closet people. Enjoy:) DISCLAIMER: There is no definite success guide to being transgender. There is...