My voice sounds 100% cis because I started off by the hard part: Yelling. Key words: Loud and crisp. Now I can yell at someone from afar or yell while arguing and still sound female. Most trans women I've seen try to soften their voices and speak very low to compensate or just raise the pitch without proper placement but it's such a bad habit! Once you can yell, Once you can sing, speaking is nothing.
Just hold different vowels/phonemes at regular speech volume then increase volume exponentially without raising pitch.
decrescendo/crescendo glissandos on your full tessitura( total range of voice even male) and hold the last note.
Stuff like that.