The first question is how you will check that you remember the material, not how many lessons you have watched. If your current method is rereading notes or replaying videos, start with the guide on highlighting and rereading, which explains what to do instead.
Next, use the retrieval practice guide to turn your existing course notes into recall sessions with feedback. If you are still choosing a course, read the text-based versus video comparison to match the format to how you study before you commit.