D18 was against the process and did not show any interest until November of her senior year. She hated tours or talking about options. I dragged her on a few for her brother. She finally got a little excited when she got into a college far away where our oldest D lives.
She did have options to live at home and attend locally or go 45 minutes away. By February of her senior year, she had gotten in and was really excited to go far away to warmer weather.
She is one who would happily live with us and lounge around if we let her. We just put her on a plane back to school today and she was grumbling. She likes it and wants to be there but definitely needs some encouragement. She is very shy and has grown a lot this year. It’s been good for her.
There’s still plenty of time for your S to have options. Hang in there. Maybe find some schools with programs or activities that might interest him?