At Brim we are offered a 6-month free trial to help restaurants and coffee shops through the COVID-19 crisis. I imagine a lot of us are offering special deals during this time. Our goal during these 6 months is to make the product as sticky as possible so they will convert at the end.
We were flying blind just assuming customers convert until we had a really obvious idea. We defined our conversion metrics, the numbers customers need to hit in order to convert to paid users.
For us, this was a number of orders coming into the shop every day and a number of weekly active users. Both of these were easy to track using our existing Google Analytics. Now every week the team can review which shops need help where in order to increase our chance of having paid customers in September!
Also don't worry, shops pay a down payment at the start of the trial so they still have some stake in the game.