Why did the Ming dynasty stop Zheng He's voyages?

Question

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The Ming dynasty stopped Zheng He's voyages because his voyages were expensive and the rest of the world was considered of little value.
Key Takeaway: Between 1405 and 1433, the Ming Dynasty sponsored a series of seven immense naval expeditions to amass treasure for China. Zheng He was placed as the admiral in control of the huge fleet and armed forces that undertook these expeditions. Zheng He visited Arabia, East Africa, India, Indonesia and Thailand. In 1424, the Yongle Emperor died. Zheng He made one more voyage under the Xuande Emperor, but after that, the expensive voyages of the Chinese treasure ship fleets were ended. Zheng He died during his last voyage.

Why Did the Ming Dynasty Stop Zheng He's Voyages