How do I go from freemium to premium?

I'm curious to know, how does one transition from a freemium model to a premium model in the world of cryptocurrency and finance? Are there specific strategies or considerations that need to be taken into account? How do you ensure that the transition is smooth and doesn't alienate your existing user base? Additionally, how do you determine the right pricing structure for your premium services, and how do you communicate the value proposition to potential customers? I'd love to hear your thoughts on this topic.