The phrase "bigger audience" means reaching or connecting with a larger group of people who are interested in or may benefit from what you have to offer. Full definition
An author platform is essential to making each book a success, and even more, becomes the power source for building bigger audiences for future books. (buildauthorplatform.com)
In fact, I believe this has become my purpose: Helping fellow authors reach bigger audiences with their world - changing books. (nonfictionauthorsassociation.com)
There have never been more opportunities for poets to reach big audiences of potential book buyers — all across the world! (selfpublishingrelief.com)