I am currently developing spring boot application which is for converting the text into an audio file. I used gtts package of python library and created a python file to make a text into audio file and send audio file in the response of the api. Now I would like to improvise the audio quality , which the audio is like human speech. I am using this for regional language for tts(text to speech). I have come across the narakeet which performs well. But I am looking for free service, I am not ready to pay money for this. If anyone have any solution or idea, really appreciated.