Email marketing, in a nutshell, is a relationship-building tool more so than just a sales tool.
The primary goal of your emails is to help your audience overcome skepticism while getting to know you as a person.
When you get people to believe that they can do what you are doing and you don't have any special superpowers, they are more likely to relate and buy from you.
Use different social media platforms as a tool to further the relationship building process.