Answer:
By traveling there, ultimately more people, further spread.
Explanation:
Islam began its extension towards eastern provinces through trade supported by the growth of the maritime Silk Roads. People knew Muslims to be marketing geniuses, prominently advocated by Islam. Also outstanding sailing abilities. Thus, they could acquire the East-West trade of the maritime Silk Roads, uniting numerous primary harbors of eastern Asian regions together. Admittedly, their trading ships had to pause at several anchorages, for: provision of water and food, improvement, or pause for shifts in wind direction.
These interactions caused the additional spread of Islam to those living in famous seaside towns.