According to the latest statistics, audiobooks are now a billion dollar industry. And audiobook sales outstripped print and e-book sales recently. Turning your book into an audiobook now gives you access to a wider audience to convert into fans.
You can find that narrator/producer through ACX, a freelance site such as Up work, or contact them directly through social media or their website.
It’s most important you choose a narrator whose voice fits your book’s style. Even if you like the narrator’s voice and demo, it’s a good idea for them to narrate at least 5 minutes of your book to confirm the fit.