This is a process described by Seth Godin known as permission marketing. The core concept of this idea is that you never market to someone that doesn’t want it, you first have to ask them for their permission. When someone signs up to your email not only do they become a warm lead but they give you their permission to send them offers and to market to them.
He says, “Look at your most trafficked blog posts or other content offers. You can then use Google Search Console to see the actual search queries that have resulted in people landing on those pages. Is there a common theme or objective behind the search queries that have brought visitors to that page? If so, build a content offer that directly addresses the theme or question behind the search queries.”
When building your online marketing plan, target one specific type of customer, or buyer persona. General information, like whether they are male or female isn’t going to work. You need specifics. Give them names and titles. Put together details that paint a larger picture of who these people are, their concerns, and their biggest pain points with regard to their business needs.
The key here is to ask regularly rather than just once or twice. Most of your followers only see a fraction of your posts, and you should be getting new followers every day, so it makes sense to request subscriptions at regular intervals. If you can offer some sort of incentive or even just promise exclusive content within your emails, that helps too.