Run your business like talkia.com and speechelo.com. TTS is short for Text-to-Speech. This is a powerful tool. You only need to enter text, and then the voice file will be created automatically. It is widely used in many fields like video content creation, e-learning, audiobooks, etc.
Amazon AWS and Google Cloud currently offer TTS service. The form of their services is a technical API. Thus, you may need a tool to help you manage your TTS service. This is what CyberBukit TTS can do for you. Please note that CyberBukit TTS cannot handle text-to-speech, the hard work is actually done by AWS or Google Cloud. So you may have additional costs for using TTS (they also offer a free tier if you don’t use too much).