Akkira
Sure akkira,
I use some of apps for monitoring my voice
- For vocal range frequency
"metronome and tuner" app on Android

(Once the app is open, press the tuner button on top, usually this feature is used to tune instruments like a guitar, but we can use it to determine our speech in Hertz.
Phones inbuilt voice recorder app
For self analysis of the voice

This helps most as well pushes you towards how you need your voice to be,
Might be very dysphoric in the beginning as most of us don't even want to hear our ugly pre-trained voices, but sometime we have to swim opposite to the water current to get to the shore. So yeah that's that.
Spectroid on Android (spectrometry)
Use it for vocal resonance

(Marking are for female and male voice patterns)
As resonance is a big reason behind identifying gender, moving tongue and larynx helps to master it
When you talk about refference to learn of other coaches.
There used to be tubers who have now deleted videos so some information is lost but only people who remember the techniques pass the information forward.
Currently transvoicelessons is a great tube to start knowing what's involved in voice training, watch everything as it's not a 1 video does it all,
They also have a website/ discord server/ private lessons/group lessons/free lessons (listen in as an audience of private lessons) on discord servers.
As of me I don't know of any voice therapist in Bangalore as of now.
I'm an advocate of free knowledge so I'd first extract all the freely available information use it, and then if some information are gatekept I'd only grinding my teeths to pay for lessons, so far I haven't spent a dime exept for a condensor mic( cellphones have dynamic mics which are Freq locked while condenser microphones have free range)
Only invest on a condensor mic if you plan to become a singer, if not it's waste of money, because any decent dynamic mics can do the job for trans voice trainings.
Apart from these breathing exercises, neck excercises, throat excercises help freeing up the voice.
Hot food and spicy food helps in achieving high voices.
There is more to voice training than what I have mentioned above, learning music theory helps to know and understand a women's voices and then to train yourself about your own voice.
Summary
1.Metronome and tuner
2.Voice recorder
3.Spectrogram
4.Excercises
5.Spice
One can start with knowing your range (1)
Then use spice to know more about your range (5)
Use spectrometry to know if your voice can reach into the resonances like a feminine voice has(3)
Excercise regularly (4)
And record record record and listen (2)
Ask me for any doubts or even further knowledge I'll try helping as much as I can.
💖