Terminal velocity is the maximum velocity an object can reach while falling through a fluid, such as air, when the gravitational force pulling it downward is balanced by the upward force of air resistance.
If you increase the speed of a falling object while keeping its mass constant, the terminal velocity would remain the same. The reason for this is that the terminal velocity depends on the balance between gravitational force and air resistance. When an object starts falling, the gravitational force initially exceeds the resistance, and the object accelerates. As the object gains speed, the air resistance also increases until it eventually matches the gravitational force. At this point, the object reaches its terminal velocity.
By increasing the initial speed of the object, you are merely accelerating it faster, but the ultimate balance between gravitational force and air resistance will remain the same. Therefore, the terminal velocity will remain unchanged.