How did Islam die out in East Asia? Especially in Southeast Asia?

/kloc-Since the 20th century, the widespread spread of Islam in Africa, Asia and Southeast Asia, as well as the process of Islamization, are usually realized through the trade activities of businessmen, cultural exchanges and missionary activities of teachers. In East Africa, through Arab immigrants and businessmen, Islam gradually spread eastward along Sudan and Nile. By the end of 13 century, the residents of Somalia, the coastal areas of East Africa and many islands at sea had accepted Islam. In West and Central Africa, Muslim businessmen, scholars and Sufi missionaries crossed the Sahara desert and introduced Islam to inland tribes. /kloc-At the end of 0/3, the descendants of Mongols who settled in Central Asia converted to Islam. /kloc-After 0/4th century, Teacher Sophie spread Islam to Kazakhstan in Central Asia and Bangladesh in the South Asian subcontinent. In the middle of the 7th century, Muslim businessmen and scholars from Arabia, Persia and Central Asia introduced Islam to China through the "Silk Road" on land and at sea. At the end of 13, Muslim merchants in Gujarat, West India, brought Islam to Indonesia, and Islam prevailed in Indonesia and Malay Peninsula in 17. From 14 to 15 century, Islam was introduced to the southern Philippines through businessmen and missionaries. Since the 20th century, it has been introduced into Western Europe and North America through Muslim immigrants, laborers, businessmen and scholars, and has made great progress. Muslims in Southeast Asia are mainly the result of Arab businessmen preaching in the local area.