Respectfully, if one is put off by focusing too much on rigor initially then I think drawabox is the exact opposite of what you want. It is an incredibly rigid, grindy way of acquiring some basic mark making and perspective skills. The first part of it worked great for me, as I am spectrummy and dont mind grinding as it puts me in a flow state, but I only stuck with it up to the 250 box challenge. At that point I was having so much fun drawing actual things I cared about that this is what I transitioned to spend my time on. I would probably benefit from sticking with it further, but I am doing this for fun rather than to become a technically amazing illustrator. My background is photography, and this is a way for me to get stuff out very quickly without finding people and places, schlepping lights, dealing with camera stuff, developing film, scanning film, removing dust from scans, color correcting, and doing editing. It's incredibly freeing.