I imagine if you don't have enough content to show for level(n), it is okay to show some of the level(n-1) content that shows your natural upwards progression
Right, you don't want to omit things you've done if they're relevant. But ideal is to show natural progression, or if not then aspiration. E.g. intro paragraph can say "I am looking for job where I can take on more responsibility, not just solving problems others found but also figuring out bigger picture strategy and how to meet organizational goals." and maybe an example if you've done it once or twice successfully.