just so you know google voice is a telephone service so i do not know how that has replaced your keyboard.
would help to know what device you have? what keyboard are you using? speech to text? as in using your messaging app? some apps will rely on their own speech to text technology. while others will rely on Bixby (if you own a sammy device) or google assistant and some will rely on the keyboard.
can you provide more context as to what is going on? just remember, the more details we get, the better we can help you.