Word choices are important, but some of the most important things are, resonance, pitch, enunciation, modulation.
Men speak in a somewhat monotone style, and make emphasis with volume.
We speak in a more modulated voice, showing emphasis with body language that is freer than men's body language, and by modulating our voices.
We pronounce the letter s in a verrry essssse way, with the tip of the tongue just behind the top front teeth. Not many men do this (thisss).
Men have their shoulders squared, or physically occupy a whole space, spreading out their limbs, and show dominance behavior.
We make fluid gestures with our hands, and use facial expression as a huge part of our communication. Most straight men do not.
Most women's faces are relaxed, and so our voices are more relaxed. Men are always on the defensive or offensive, and speak in abrupt, staccato-like sentences, almost punching out the words.
That......and a million other nuances separate our communication from that of men's. The most important thing, is to speak female all the time. Every ticking second, minute, and hour of speech should be female, unless you are not full time, or if it is painful. You transitioned your body, or are, I presume, so (my opinion) you should also transition your voice. Everyone wants it right now, but it takes time. It would be like wanting "insta-breasts" in your very beginning transition. But it takes lots of time, and so will your voice.
Good Luck!
Bev