Why did Zheng He make seven voyages to Southeast Asia?

Zheng He’s seven voyages to Nanyang were not to do business and establish colonies, but to trace the migration history back to his Arab ancestors, Xiao Xian, a professor at the School of International Relations of Yunnan University, argued. Zheng He’s seven voyages to Nanyang Spread of Islam in Southeast Asia. In China before Zheng He's voyage, Islam had developed greatly. Chinese Muslims strictly abide by their beliefs, established a regular education system, developed the cultural education of Chinese Muslims, and built many magnificent mosques in various places that reflect the fusion of Chinese and Arab arts. At the same time, in Southeast Asia, due to the influence of Indian culture, Hinduism and Buddhism were also popular. Islam still had no influence in most areas, and only a few people in the area believed in Islam. When Zheng He sailed through Southeast Asian countries, wherever he went, he had to hold ceremonies and promote Islamic teachings with his fellow Muslims Ma Huan, Guo Chongli, Hasan, etc., and established Chinese Muslim social areas to spread Islam. With Zheng He's propaganda of Islam in Southeast Asia, Islam developed rapidly in Southeast Asia, especially in Indonesia and Malaysia. After that, the information on Zheng He's seven voyages to Southeast Asia was destroyed by the Ming Dynasty itself. Why did the Ming Dynasty destroy itself? It has become a century-old mystery!