Hmmm, try seeking a voice trainer / therapist, they can help you find the right pitch and how to project your voice.... if that is still limiting then reach out to Yeson in Seoul (Korea)...
I have heard some great results from there, not sure of costs, but is quite quick, but requires no speaking for a period of time, and relaxed limited speaking after for a while, but very, very effective. I will look there at some time soon...
L Katy