The idea with making a course free is to get people to take the course and give you reviews (aka creating social proof). You have 1500 students and 1 review (a good one, which is awesome!). Try to create an educational announcement to get people excited about the course so they start it and eventually give you a review. The best way I found to get involvement is to create a connection with your students. Give them a challenge, give them updates, invite them to ask questions in the Q&A, whatever it is, get them involved.
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