Success/ Thank you page upsell

A user that has already converted once is more likely to convert again. Therefore take advantage of the final signup page of the free version of your product to show the benefits in comparison to your premium version. This will make users aware of what they are missing out on, and increase their chances of conversion. Be sure not to overdo the upsell because customers might be annoyed if you are too pushy. This guide has all the information you need.