Your email marketing numbers are all over the place. One email works well. The next falls flat. The third barely gets off the ground. What gives?
The problem might be that you are not judiciously evaluating emails to see what elements work best. A/B testing is the solution. Companies like Ladder.io have software that works with email marketing platforms like MailChimp and allows you to experiment with A/B split testing to pinpoint the "little things" that make all the difference. Is it the title? The call to action? An embedded image? A/B tests can reveal which parts of your email marketing are hitting their targets and which are falling short.