You absolutely need to focus on staying in constant communication with your subscribers.
This doesn’t mean that you necessarily have to email them every day, but what you want to do is consider creating a posting schedule so that you can get into the habit of connecting with your subscribers regularly, while demonstrating consistency.
Your subscribers will then begin to expect your emails on certain days and by doing this, you will begin to see improvement in the response rates.
The more responsive your list the better your business will become.
When you are consistent with your broadcasts, the easier it will be to condition your subscribers to accept promotional based emails and advertisements in between mailings containing free content and resources.