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

1. Modify the design to resemble a bench: The current design is too abstract and lacks the typical features of a bench such as legs or a seating area. The design should be adjusted to include these features to make it recognizable as a bench.

2. Adjust the initial sketch to resemble the letter 'h': The initial sketch does not resemble the letter 'h'. It should be adjusted to include the continuous vertical and horizontal strokes typical of the letter 'h'.

3. Ensure the extrusion of the sketch forms an object that resembles a bench: The extrusion process should result in an object that has the recognizable features of a bench. This includes elements such as back support, seat contours, or legs. The current object is more akin to a sculptural or architectural model than furniture, so this needs to be corrected.