Based on the answers provided, the following corrections need to be made to the 3D object:

1. Increase the height of the object: The object is not currently tall, so to correct this, the height of the object should be increased while maintaining its rectangular prism shape.

2. Clarify the width of the object: The object's width is currently unclear. To correct this, the width of the object should be adjusted to clearly show that it is narrow in comparison to its length and height. This could be achieved by reducing the width of the object.