What is the best way to shift existing hourly clients over to a fixed monthly retainer model without losing them?

[Btaliat]

If there is a need for the freelancer to get himself and the clients transitioned from being a freelancer that charges hourly to the ones that charge monthly, there is a way of getting this done. You only need to make sure that you are focusing on the right clients and send a proposal that will explain the reason for your transition. Ensure you go for the convincing ones to make it easier. What do you think about this?