Do Authors Need to Advertise and Where and How Much?

i attended digital book world, virtually, and there were several sessions on a i narration as well as one on nft. Both companies say a i generated audio is the way i narrated. Deep zen said only eight % of e books are available in audio book and 90 % are in english. Speech key say they have 251 realistic voices across 72 languages,. They're dropping the price from 400 to 800 dollars per minute depending on the voice you choose within 12 hours.