That's what I'm doing. Working on that perfect pitch letter. You may write a great novel, but unless you can play salesman and convince someone to publish it, no one will know. I can't believe how much time I'm spending on this. Draft after draft, just trying to get the wording right.
There are actually entire books about how to write a "query letter". The query letter contains your pitch. You send it to an agent or publisher. If it's stupid, or doesn't follow the exact format, they won't read your book.
Plus, I have this terrible fear of rejection so I've never submitted anything to anyone, ever. And guess what? I've never been rejected. How many other writers can say that?