You are receiving some excellent advice in this thread.
One thing that I haven't seen yet that I'd like to contribute is the value of the postmortem. That is a time that the team meets to evaluate the season. Everyone comes prepared with ideas and suggestions of what went well, what didn't go well, and what can be improved upon. Someone is charge of writing down all the pros/cons/needs for improvement on the white board. Then we divide it into sections: robot, Chairmans, Spirit, Safety, etc. We can get a little loosey goosey and start crossing over into sections so our teacher keeps us on track and in one section at a time. If they cross or mix, we make sure to note that further discussion is needed.
There should be plenty of time allotted for this meeting. If it has to end before the postmortem is completed, schedule another time to finish it. Then, next year, make use of the suggestions. Learn from what you have just achieved and implement it.
We compete in a fall competition as well, BEST, and at our postmortem for that this year - we learned that one of our freshman team members did not want to do anything but work with tools, building. It could be the field or robot, but that was all she wanted to do. She was not interested in anything else. We were able to apply that information to FIRST, telling her that it was up to her to sign up and talk to the sub-team lead of the area she was interested in. Some students will work in any areas under the sub-team leads. Some will not and sometimes hang back or don't contribute too much - but they continue to come to robotics. That means that there is interest, the trick is to find out/identify what the interest is and how to apply it.