As someone who recently came to a team much like yours, I can understand where your cooking from. For us, the students were willing to work more, but the mentors werent. If you have a similar issue, then you could try getting a parent who is willing to stay on the shop and allow students to work.
Also, remember that sometimes the drive to succeed needs help, so it can take a while to get where you want. Don't give up if it looks hopeless
