There are several options to sell your own book. You can sell it online marketplaces, you can sell your book on popular online marketplaces such as Amazon, Ebay, Or Etsy, There platforms provide a large customer base and easy to access to manage your inventory sales.
You can also post it on any social media you have, you can also create a website or a blog to showcase your book and provide additional information about yourself as an author.
You can sell the books at bookstores, But this may require some effort in terms of pitching your book to the store and negotiating terms, But it can help you get your book into the hand of local readers.
You can also consider using self- publishing platforms like blurb, lulu, or ingramSpark to print and distribute your book. There platforms offer various services such as editing, design, and marketing tools to help you create and sell your book.
I hope that I was able to help you provide the options and this will help you get an idea on how you can sell your books, Goodluck!