If you’ve written a book, you can choose to self-publish or get it published by a traditional publishing house. Because you have these two options, you don’t necessarily need a publisher for your book.
While getting a traditional publishing deal is a dream for many writers, you don’t actually need one to produce a book and sell it. Many ebook publishers are able to release a variety of titles because they don’t have to go through traditional publishing steps.
You can easily self-publish on Amazon Kindle Direct Publishing, or even create an ebook that you sell on your website. If you already have an audience, self-publishing is a direct way to get your book to the people who will be interested in reading it.