Try the No Zero Days strategy - work on it a little bit every day, even if you can only commit 10 minutes. And if you miss a day, don't beat yourself up or try to make up for the missed day by doing extra; keep going on as if you hadn't missed a day.

Welcome back! As a fellow deserter who has returned after an extended absence, I can only offer you my experience and what worked for me. I'm gonna apologize in advanced for the lenghtly reply, but there's kind of a lot to say here.

TL;DR:

I think that (unfortunately) external circumstances in your life will be a far bigger determining factor than your internal dedication/interest with regards to whether you finish this course or not.

The truth of the matter is you can be the most interested and dedicated student, perfectly willing to dilligently go through the course work as intended no matter how long it takes - and yet no matter how willing you are, if you are not able, then you will struggle. Our ability to work through the material is a combination of our desire and our circumstances, and these two things are entirely separate from one another.

In my case, I discovered DrawABox over a summer break about halfway into my undergraduate degree (computer science, not art related). I spent the summer going through lesson 1 and almost halfway through the 250 box challenge, but when the semester started back up, I realized the time investment to properly work through this material (adequate time with warm ups, 50% rule, truly spending enough time to execute each line to the best of my current ability, etc.) was entirely incompatible with my studies, which were costly and important to me in other ways. I had to abandon this course, not because I was disinterested, simply because it wasn't the right time in my life.

Having finished my degree and found myself in a suitably stable position in my life with ample time to allocate to this work, I am working through the materials again with the same fervor as before, and am past lesson 5 and going strong. The primary difference this time is that I just happen to find myself in the fortunate position where my responsibilities, financial situation, and personal life have all aligned to allow me to do the work without adding an insane amout of pressure or stress on the rest of my life, which I know for most people is just not usually the case.

This course is demanding and difficult. You are asked to spend a truly siginficant portion of your time working on technical practice, not just on the lesson materials or the exercises, but on warmups and 50% rule work, which effectively doubles the time required to finish. As a concrete example, consider the difference between spending 30 minutes every day versus an hour every day doing something. I think you'll agree that 30 minutes a day is something most people can consistently carve out the time and attention for, and for an extended period of time (like every day for several months). But an hour? Now you're starting to have to make more significant sacrifices in order to spend that time. That hour can't just get tacked onto your normal routine - you have to give up a full hour of your free time (which is often severely limited) to work on something taxing and difficult (this course work is often not relaxing). On top of all of that, consider what the somewhat glacial pace of 30 minutes a day actually means in the full context of this particular course:

If you want to spend 30 minutes a day working on the exercises for this course, you have to spend 30 additional minutes on 50% rule work and an additional 10-15 minutes of warmups, for a total of 70 minutes conservatively. Now we're up to over an hour a day, which for many people is just too demanding. If we want to keep it at 30 minutes, we're spending 10 minutes on warm ups, 10 minutes on the exercises, and 10 minutes on 50% rule. I'm gonna go ahead and tell you right now, you will never finish this course at that pace. 10 minutes a day on the exercises is just entirely not enough time - some of these exercises, like a single row of the texture analysis, took me between 1-3 hours for a single row (depending on the complexity of the texture). If you want to spend enough time daily to make any significant progress on this course, you have to make sacrifices in your life. I got lucky, and find myself in a situation where I am able to sacrifice enough of my time and energy to work on this material without putting a high degree of stress on myself or others in my life (my current responsibilities are somewhat limited at this point in time). But for many people, the time/effort required to be sacrificed in the interest of finishing this course is simply too much at that point in their lives. It all comes down to circumstances.

I think the most important thing to consider is how much time are you willing/able to sacrifice without putting undo pressure on others/yourself, and if that time is less than an hour a day, then you probably aren't in a position to make significant progress on this course in a reasonable amount of time. That doesn't mean you can't ever finish, just that it's not the right time right now.

And remember,all of this feedback is specific to DrawABox. This course is not for everyone, but don't forget that this course is but one of many resources out there - in Uncomfortable's own words, this course is designed to help you "make sense of all the other resources and tutorials out there", of which there are so many that require significantly less of a time investment, and maybe those will be right for you. If you have the time, I think this course is a tremendous resource and fully worth while. If not, don't fret! Your art journey can continue, just not down this route. Thankfully you have many paths open to you.

Hopefully this helps, good luck on your journey!