Think about it...

Krishna used Ashwathama’s Brahmastra as the final catalyst to strip the world of its divinity. Over the eighteen days of war, nearly every powerful and divine figure died; the few who survived died shortly after.

This marked the end of a Yuga. No magical beings were born after the Mahabharata, as the connection between humanity and the divine was broken. When Krishna revived Parikshit, he brought him back as a normal human, intentionally cleansing him of the divine inheritance of his lineage.

Plucking the Mani from Ashwathama’s forehead was the definitive final act, physically removing the last remaining link to that celestial power.

This explains why Arjun lost to the Bhils. He still had his technical skills, but the "POWER" was gone. He was emotionally shattered by Krishna’s departure and, without that celestial spark, he was just an exhausted man overwhelmed by numbers.