4:13 AM, Tuesday May 31st 2022
Drawing boxes in perspective is really hard in the beginning. If you're doing the 250 Box Challenge, then you should just do your best with each box and move on, not be crumpling up page after page till you get it right. Over time as you continue to attempt to draw boxes and other objects in perspective and strive to understand, it will come to you little by little. Spacial reasoning likely isn't a skill you're going to just get and then have it; for me it wasn't a light switch, but rather a progress bar. Don't let your lack of understanding keep you from completing the exercises. Just do your best to complete the required number of pages with a reasonable level of effort (you shouldn't have to kill yourself) and then get it critiqued.
Before I did Drawabox I studied perspective and rotating boxes freehand quite a bit (which was really hard, especially at first, but got easier with regular practice over many months). I also studied Marshall Vandruff's perspective video series which helped a bit. He discusses the "three-line system" referring to the 3 axis of 3D space, which are represented in a simple box. If you can draw a "solid" box in any orientation and rotate it around at will (with understanding of how it sits in space), then you're well on your way to understanding how the rest of the visual world works spacially.
Edit: I just looked at your submissions and saw that you just completed the 250 Box Challenge. Way to go! That's a great achievement. As you do your additional 30 boxes, I hope Comfy's advice starts to sink in.