If the op is still following this post, I would recommend a few basic marketing tips. 
First, publish some content on your blog or simply remove the blog section altogether...having one outdated article appears like you aren't in business any longer, or that you don't have anything to say about your business area. Write blog posts that deal with technical analysis to prove that you know something.
Second, update the reviews on your course sales page. Two reviews from the same date look suspicious, and one of the reviewers hasn't even read the material. If you can't find anyone to review, give copies of the PDF away in return for a review or testimonial.
Last, and most important: how is this technical analysis course different from all the other free and paid TA courses out there? I'm giving you the benefit of the doubt that you know how to perform TA in general, but how does this relate to cryptocurrency? What have your results been, if you actively trade crypto? Have you documented any results from your students and customers? You really need to make a strong argument that your course is superior to my ability to go to YouTube and watch some random guy explain support and resistance.
All the answers for you are in the feedback provided on this forum! Just pay attention to the comments and make some adjustments and I'm sure you will start to sell more PDFs. The objections and critiques offered here are from real members of your potential audience!
Good luck!
							
				