What should I do to those users who are not responding to my emails? They have subscribed to may emails but they are not responding to my emails.
If you know where your subscribers lie than you can go to those channels and find out actually what they want. Then you can use those things in your email headers and ofcourse you should provide them some valued information in your emails about it. I am sure that they will respond to that.
Yeah true. Don't rely on only one medium, try to outreach them through proper and different channels too.