First of all, Genghis Khan's Mongolian fighters, as the most powerful troops on the plains, are difficult to fight against rivers, lakes and seas, and mountains and hills have played the greatest role. They galloped on the plains and became Ma Pingchuan, but they couldn't move in the face of geographical obstacles! In terms of maneuverability and combat capability, it is far less flexible than infantry.
Genghis Khan was born in the Mongolian Plateau and Siberia, with a dry and cold climate, while India faces the Indian Ocean and is relatively close to the equator, so the climate is humid, which makes it difficult for these warriors to adapt. When they fought in Southeast Asia and South Asia, it was hot summer, and many Mongolian cavalry who immediately exercised violently suffered from heatstroke, and their combat effectiveness was seriously reduced.
Finally, India's strength at that time should not be underestimated.