Teen shutdown is often accumulated load, too many deadlines, too little sleep, unresolved stress, and not a single-moment problem. When the nervous system is maxed out, executive function, planning, sequencing, starting, goes offline first. What looks like laziness is frequently a brain that genuinely cannot organize itself. Recovery has to come before productivity can return. When shutdown is frequent, look at the burnout patterns: is your teen Pushing Challenge beyond their wellbeing? Are they a Workaholic who cannot stop? Have they Lost the Key, with too few entry points into flow so that when one is blocked they cannot access it at all?
I am not going to pretend this is not overwhelming, it clearly is. What is the one thing that, if you did it, would take the most weight off?