Udemy ist just the platform that hosts (and to some extend markets) your course. But sales do not happen automatically.
1. You need unique, excellent content that is in demand!
2. The world (or at least your target group) needs to know about your course!
What is your target group, anyway? Perhaps medical students?
So, being active on the Internet (YouTube, Website, social media, Google marketing) is vital, I'm afraid.
Just some remarks, concerning the typography of your presentation.
You seem to write everything in CAPITAL LETTERS. THAT MAKES READING MUCH MORE DIFFICULT. In text, all caps is used very rarely, just for headlines or if something is very important, indeed. Not in body copy and not all the time.
You sound is okay, however, sometimes, you seem to have an echo and the volume is changing.
And one last remark: It would make the presentation much more inspiring if we could see you explaining the terms. It is so important to see teachers, their face, their eyes, their body language! You could combine talking head videos with slides.