To me it sounds like you are speaking in falsetto, rather than speaking as you would have before transition. Are you actually using falsetto?
No amount of resonance training will make falsetto seem natural sounding with or without the Yeson operation. You'll need to speak as you would have before you transitioned to return to the starting point where resonance control can make a difference to your timbre. That might mean accepting a much lower pitch, but not definitely - I can do falsetto right down to within 4 notes from the bottom of my voice. You might just find you can use the non-falsetto voice at a 200hz+ level comfortably.
With the pitch variation during a sentence, currently you never really drop beyond the pitch you began at - you only vary it up from that point and return to it. I imagine this is because if you go lower your voice will crack out of falsetto into chest voice and you are trying to avoid it?
So the first step is to stop using falsetto and start a lot lower in your chest voice. Then, you need to vary your pitch both up and down from your starting pitch, and by a LOT. I can tell you're in a habit of speaking in monotone and that a big part of that will be because everyone in your area speaks that way to some extent. You're going to need to vary your pitch up and down in a way that seems ridiculously exaggerated when you do it to overcome the cultural practice of staying monotone that you have grown up with. It will be making the women in your area sound relatively masculine compared to women from other areas as well if that's how they speak there. Probably a few cis women there don't pass on the phone as female.
I am 4 months post op. My voice sounds *exactly* the same as before the operation, except now I am not consciously raising my pitch to talk, and I am a bit raspier. Both before and after the op I spoke at about 176hz. I've lost the bottom 4 semitones of my range and falsetto is easier to access so I know nothing has torn or come undone, but the increase in default speaking pitch has only been about 40hz at this point and it really doesn't feel like it will change after being steady for 2 months. My tessatura have not moved - my shifts from chest to head and head to falsetto occur in the same places. I have to admit I am really disappointed by the operation. I already had resonance and prosody down pat and had a passing voice. All the operation did was leave me with the same voice, without one component of effort, which was raising the pitch. I don't find this fundamental speaking pitch level one that makes me feel good about my voice, and I can't raise it because I run out of head voice notes for pitch variation above the fundamental if I do. I'm just really disappointed with the entire thing and at least at this point post-op, if I had the time over, I would have put the money into lipo instead of voice.
Also a question about voice therapists - the one I saw was only interested in producing FULL projection resonance. I didn't find it helpful or practical to use that as it makes me sound like a booming male. Do they all do that or do some acknowledge that full resonance exposes the size of your masculinized resonating cavities and instead focus on tempering the resonance to sound as though it is coming from unmasculinized resonating cavities?
