That’s a tough situation. Obviously, you can’t force him to be content in his job, or even to keep it.
However, you can support him in what he’s going through (the boredom and restlessness) and try to help him see the value in his job (without judgement and nagging) and/or help him find a job he’d enjoy more.
Boredom and restlessness are very real struggles for many with ADHD. The ADHD brain needs interest or urgency to engage — importance doesn’t do it.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism