Prepare a great promo video for the course and also post it on YouTube where you also link to the course on Udemy. Then also post the YouTube video to your social media. Make sure you have many cross-links from one to the other. Make sure to reply to all your students' Q&A and private messages as well as to some of their reviews. Having this traffic should increase the organic reach to your course plus it shows that you're active and helpful so your courses are more relevant. You should have more than 1 course, preferably in a related subject. Once you do that, you should market one course to the students of the other courses who haven't yet taken the course you're marketing. Offer them great discounts via a coupon with a time limit so that they won't want to miss the opportunity to get your other course at a great price, especially if they liked your other course.
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