Email Subscriber list not growing anymore

[batman]

First of all don't need to panic it happens some times. Even in the case of large sites it happens. Check that the viewers are returning visitors or not. If the number of returning visitors are too big then ofcourse the signups will be less. Then try to get more traffic and more unique ones. And also my advice to you is that install that signup banner in each and every page of your site. I am sure it will help.