There are many places where you can submit book reviews, including:
1. Online retailers such as Amazon, Barnes & Noble, and Goodreads
2. Literary magazines and websites such as The New Yorker, The Paris Review, and BookPage
3. Book blogs and book review websites such as Book Riot, The Book Smugglers, and The Book Review Directory
4. Social media platforms such as Instagram, Twitter, and Facebook
5. Local newspapers and magazines
6. Your own blog or website
It's important to make sure you follow the submission guidelines for each platform and provide an honest and thoughtful review of the book.