I’m not a recruiter or Supervisor, but I would suggest looking at mid-level jobs that are available, and see what kind of skills they are looking for in the job description. Then try to incorporate as many of these skills as possible in your reel.
These would typically be, from my experience, round excellent compositing skills. Tracking (2D and 3D), multi-pass compositing, 2.5D Compositing, projection, grading, cg integration as well as the more junior type of stuff such as keying, prep and roto.