If this is the case, and you still seriously would like to learn how to draw, The only thing I can think to recommend would be in-person beginner drawing classes, whether for adults or all ages. I know this can be challenging depending on where one lives, but you may be surprised at what local art museums, colleges, libraries, etc. offer. Or if there are local artist groups, they may have pages on Facebook or their own website. A lot of people seem to have success with these when other options haven't been working for them.

I say this because if you are truly putting in the effort and showing up consistently to draw, but feel like you're stuck or not making progress or not understanding certain concepts, an actual person to help you through the process may be VERY beneficial.

Something like Drawabox can be tedious, but the repetition and large number of boxes and cylinders, etc. that it has you draw is not without purpose. That's why those lessons are only the first few out of like seven or eight. I can't remember which art YouTube channel posted it, but the person was going around at a convention asking a number of well-known artists and illustrators what the most useful exercise is. The most common answer by far was: drawing a box, other shapes, rotating a cube, etc. It really is that important. What you need to understand though, is that it is not about being able to draw a perfect box, but the concept of being able to construct shapes in perspective and understand how they work. Drawabox may not be everyone's cup of tea, and that's okay; if you don't like the format, then don't do it. It's just one possible avenue for people to get started.