I am not an authority in this subejct, but I have released my first course in march and it is selling well, so I will give my sugestions for you to discover the reason of the low conversion rate of your course. You said that your promo video has a cinematic apeal. Maybe you should try the opposite, because maybe people are not looking for a cinematic promo video, but a more direct video that tells clearly what they will learn in your course, who you, the instructor, are, and for which people your course is good. I suggest you to read the article "the perfect promo guide" from udemy. It can be a good starting point to rethink your promo video. Another thing to do is to give a look at the udemy marketplace insights and discover the demand for your topic, and who are the competitors. Looking at the average conversion rate on this topic is a good ideia too. Finally, I do not think you should wait much months for your course to get traction. Rather than this, you are probably right to think that something is wrong, and you are doing the right thing looking for answers.
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