I sometimes receive cold calls or queries that begin: “I don’t know anything about publishing but…” If that’s the case, you need to make a few stops before contacting a literary agent. One great resource is Jane Friedman, a respected expert on the publishing industry who offers a myriad ways to access the information and process you need.
Here’s a link to her courses and book: https://www.janefriedman.com/online-classes/
Take a class with Jane or another publishing expert that meets your needs: writing a book proposal or how to submit a manuscript. It could make all the difference. That way when you do reach out to literary agents, you’ll have a much better chance of getting a positive response.