“If we see you come back and you seem to be focused because whatever classes you're taking this semester are a great fit for Quizlet, maybe we should be refreshing that trial for you because we usually have added a lot of value. If it's been a year since they subscribed, often it's a nice way to say hey here's all the things we've added.”

Refresh the free trial for re-engaged returners — but gate it on signal

Treat returning churned users like new users when enough time has passed — re-grant a trial and re-onboard them on the features added since they left. Gate the offer on engagement signals (current usage, time since churn) so you don't fund freeloaders cycling trials each exam season.