you struggled with getting the lines to converge properly the entire challenge, which is completely fine, you aren't alone.

Are you using the Y method? it is the best way to draw boxes at this stage, since it allows you to grasp all of the box's dimensions at once.

Also, it looks like you would have benefited from reviewing the instructions, since sometimes you forget to follow guidelines such as "keep the y's arms at angles greater than 90 degree else the box will look weird."

Your lines are confident.

A common issue (seen on boxes no. 41 and 48( is that you will have two lines with shallow convergence coupled by an extremely step line.

Also, you should extend the lines as far on the page as possible, this will make your mistakes much more visible.

The lines also diverge from time to time.

also, the first firty don't have vanishing points