My son has ADHD/ASD. There is a high risk of failure to launch in that group, so in addition to evaluations, therapies, medications, services and accommodations from K-12... I needed to help him apply to college, and now I'm helping him find jobs and volunteering opportunities. He's 19. He wouldn't have been able to do any of this by himself. He works hard when he understands it's important... but he needs a lot of structure and support.
One day, I hope he can have a stable career. Right now, his brain is not mature enough to handle his life by himself.
Maybe your son needs an evaluation by a psychologist.