Voice is a real bear to get right at all times. We have a default voice that we slip into when distracted.
The only way I know of to feminize that default voice is to practice using our feminine voice and only our feminine voice. Any use of male voice reinforces that as our default.
I've been at this about two years and it finally seems to be becoming my new default. My speech therapist told me when some one cuts me off in traffic and I cuss them out in feminine voice that I'm there!

The surgery will definitely help get the pitch right, without the damage some of the "quick fix femme voice" stuff on YouTube can cause. I did the pitch the old fashioned way, therapist work and practice, practice, practice! Every morning I'm alone it's "Eeeeeeeee", "Oooooooo...", breath and scales with a pitch app, then spoken passages into a frequency analysis app. I've slowly moved into the feminine pitch range.
Singing hymns in church is still really rough as a "learned alto"!
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