I'm in the same boat as you. After being the CAD Lead on team 540 this year, I'm also graduating from my FRC program.
One thing that I've looked for is Formula SAE, Baja SAE, and Engineers without Borders organizations at colleges and universities. They're similar to the robotics programs, just with a different focus. They are definitely activities that I will participate in next year.
Of course, this doesn't have to be the end of FIRST. There are plenty of teams to mentor out there, and many universities are affiliated with teams, so don't think FIRST will leave your life entirely unless you want it to.
