1:27 AM, Friday September 9th 2022
I completed the 250 box challenge a year ago, but a couple days ago I decided to start getting official critique, and they told me that I only had to redo 50 boxes. So in my opinion, you should just start from where you left off and complete the 250, and then add on an extra 50 (you should also rewatch and reread the instructions). Though I believe a consistent routine is the best way to go about completing DrawABox, I don't know what it's like to have ADHD, and I do not have advice for you on that matter. I wish you the best, though, and I hope you figure it out!
ALSO! Remember that slow and steady is better than nothing at all, and even 1 singular box a day would be better than 0, if that's all you can manage (of course, you can do more if you feel like it, but I feel perhaps shooting for a minimum of 1 would be good)