Sending too much wrong content to the wrong people at the wrong time is known in the email marketing field as list fatigue. But the good news is your problem is easy to solve.
Here are two subjects about why your customers have lost their interest in your email marketing emails, and what you can do about this.
1. Know your target audience
You should really know your target audience, what kinds of email content they love, when is the best time to capture their attention and send your email marketing email.
Also, you should create versions of your subject lines and test them against each other, like create one long a done short email and see which one is the best. Besides that, testing helps you focus your email marketing strategies on what you know Works best for your audience, so you can optimize your email marketing campaigns.
2. Schedule your delivery
When people subscribe to your email marketing list, send a welcome email to tell them what they will be receiving and how often. If your customers know what they get from the outset, they will not only expect to see your email in their inboxes on a regular basis.