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The Constitution does not say that regions must have 10 states. This was only included in an Amendment which DID NOT PASS. Instead, we passed an amendment under which regions did not have 10 states. It is done.
When was the amendment NOT passed? As far as I am aware...everyone voted FOR amendments 1 through 5.
We were asked which of four versions of Amendment IV we wanted, one of which was the version in your draft (The 10-states plan), another was the set of maps that won the vote that was taken among many possible maps (The "D&E plan"). The D&E plan was preferred by a clear majority of voters over your version of the amendment.