Based on customer response, classify your subscribers based on availability, active readers, inactive readers and readers who rarely interact. With this, you will know who to focus, how to focus, and where to focus a lot, and you will maintain the goal of turning inactive users into active usage and interaction.  Experiment with emails based on response: Every customer behaves in a unique way because they have their own likes and dislikes, so we should make sure we attract customers who value the areas the most. For this, you need to do a simple response check where you need to send emails during a certain time interval and wait for the response, then send emails with a particular form of subject, send with appreciations or special offers and many similar emails and wait for a response from the recipient and separate them accordingly. Some customers might be active users in a certain period of time, some would only accept liked emails, few would follow the subject, and others might only click when they see head-turning offers. This is because each customer has a unique characteristic and you need to make sure that your email appeals to each one