You probably have subscribers on your list that haven’t opened your emails for six months, one year, or even more. Whether their email address has become invalid, or they’re simply not interested in your messaging, consider removing them from your email list. Removing these subscribers will negatively affect your subscriber count, but it will positively impact your list quality, which is more important. If you get rid of these disengaged subscribers, you should see engagement rates rise. You can send a re-engagement campaign asking these subscribers if they’d like to remain on your list or be removed. If you don’t get a response, you can feel confident removing them.
Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads. Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.