Career / Education Counselors. All types and kinds. Send brochures, have special open house days just for guidance counselors, meet with them one on one –whatever you have to do to help career counselors understand your vocational / trade school as much as possible. The more they understand your programs, courses, and classes, the more likely they’ll refer students to you.
Go beyond just high school as well: there are many professional education advisors (including organizations supporting their industry) that you can access.
Rent a bus and give them all a ride to your campus if you have to. Teach short courses at their campus. Be persistent that they inform you when and where any career day events or college fairs are being held.
Guidance counselors are amazing resources for the activities that are happening in the entire education district, not just their own school. They’re your connection to a much wider network of all that’s happening in that school district.
