What was most likely the reason that ziggurats were tall

The ziggurat's purpose is to get the temple closer to the heavens, and provide access from the ground to it via steps.

Explanation:

Ziggurats were built by ancient Sumerians, Akkadians, Elamites, Eblaites and Babylonians as part of temples complex which included other buildings dedicated to worship the gods. Only priests were permitted on the ziggurat or in the rooms at its base, and it was their responsibility to care for the gods and attend to their needs. These ancient societies believed that these pyramid temples connected heaven and earth. In fact, the ziggurat at Babylon was known as Etemenankia or "House of the Platform between Heaven and Earth".

dear friend:

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your friend,