Why did the Ming dynasty stop sending Zheng He on voyages and limiting outside influences?

I looked it up online and it said, “First, the Yongle Emperor who sponsored Zheng He's first six voyages died in 1424. His son, the Hongxi Emperor, was much more conservative and Confucianist in his thought, so he ordered the voyages stopped. ... For all of these reasons, Ming China stopped sending out the magnificent Treasure Fleet.” Hope this helps!