From the time my boys started high school I tried to step back as much as possible. IMO that is necessary (in most cases) to allow them to become their own person, to learn to take responsibility for themselves and their descisions (along with the consequences whether good or bad). IMO it does young adults a diservice to make too many decisions for them, to make sure they are doing what they need to do for school or a job.
Now, for my younger son, things took a turn when he started down the road of drug use along with not doing well in school. We ended up sending him to a rehabilitation wilderness school for a year. Bur for my older son, I stepped back and let him discover his own way as much as possible while always making sure he knew I was there for him at all times.