Do not send out anymore emails to your list until you give yourself a good shake. Your list is the most valuable thing you own. Well it’s maybe not the most valuable thing you own, but it is to the people who use their list properly, which is a rarity these days. If you’re not making good money from your list it means you are doing something terribly wrong. Once people start unsubscribing they won’t come back. Is that what you want to happen?
You need to get creative with SEO and realize that there are several different things you can do.