Aurangzeb himself.
Because he trusted few people and didn't trained his children as a warrior and an administrator .
Secondly, he made his empire so large and unmanageable, that it became so complicated for his deputies to capture.

The Decline of the Mughal Empire
The decline of the Mughal Empire was a complex process that involved various factors and individuals. One of the key factors responsible for the decline of the Mughal Empire was the weak leadership and succession issues among the Mughal emperors.

Weak Leadership and Succession Issues
The later Mughal emperors were often weak and incompetent rulers who were unable to maintain the stability and unity of the empire. Succession wars and conflicts among the princes further weakened the empire and made it vulnerable to external threats.

External Invasions and Attacks
The Mughal Empire faced constant invasions and attacks from various external forces, such as the Persian ruler Nadir Shah and the Afghan ruler Ahmad Shah Abdali. These invasions not only weakened the empire militarily but also drained its resources and economy.

Administrative and Economic Decline
The Mughal administration became increasingly corrupt and inefficient, leading to economic instability and widespread poverty among the population. The revenue system also became exploitative, further burdening the peasants and causing discontent among the people.

Rise of Regional Powers
The rise of powerful regional powers, such as the Marathas, Sikhs, and Rajputs, challenged the authority of the Mughal Empire and further fragmented its control over different regions. These regional powers gradually gained strength and independence, weakening the central authority of the Mughals.

Conclusion
In conclusion, the decline of the Mughal Empire was a result of a combination of weak leadership, succession issues, external invasions, administrative and economic decline, and the rise of regional powers. These factors collectively led to the gradual declination of the once mighty Mughal Empire.