I’m going to ignore the blatant flaws in logic that go into the below chart and focus on the redesign challenged here. There are two inherent problems with using 3-dimensional surfaces like spheres or pyramids for comparing data. First, humans have a more difficult time understanding the magnitude of a change in volume than they do of area length. Second, as it appears in this case, the height of the pyramid is used to determine the delineations instead of the volume, meaning the chart is inaccurate in the first place. While mine may not be as cute, it is certainly more accurate and (hopefully) easier to understand.
Redesign (I tried to keep it simple):
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