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We've started charging new users and the conversion rate has been good. Now the question is, how do we transition our existing free users? There is a chance some people are gonna get pissed (even though they've been using our service for free).
Are there any best practices on what to do in such a situation? The first thing that comes to mind is to offer a discount on the yearly plan. Anything else?
[0] - https://lookastic.com