Uggh, I wish Glide would just fix this bug because people keep running into issues if they have apps that involve google sheets in one way or another. The importing issue feels new, but if you say that it was still somehow linked to the actual google sheet, then that’s the problem.
First of all, the issue has nothing to do with your other teams. Teams are independent of each other. Independent billing and independent limits. The issue is that you have zero availabile updates on a free plan. Glide should not be allowing anything to accumulate updates in the first place, but the link to your Google sheet causes one single sync that puts you over your limit and immediately you are locked out. You should not have been allowed to get into this predicament in the first place. The fact that you could makes me feel that this is a bug.
First you need to make sure that none of the apps in your free team are linked to a Google sheet. Then your options are to wait a month for the update count to reset, or create another free team and transfer the app to that team. It’s dumb, but those are the only options until the issue gets fixed.