How to make users of your website subscribe to view content

Question

How to make users of your website subscribe to view content
A certain amount gives them unlimited access and another smooth gives them restricted access using JavaScript

Answer 1

This seems unrelated to programming as it is more if a marketing question.

The 4-Hour Workweek by Timothy Ferris talks about how to get subscribers. It discusses things like A/B testing of copy and prompts, valuable free samples, etc. I'm sure there are any number of other similar books out there describing how to convert viewers to subscribers.