The Idolmaster if it can be cheesy.
Mushishi though it’s not about a team.
Aim for the Ace! may be the closest, and I strongly believe that Hibike! Euphonium is intended to be a retelling of this story. Kill la Kill for the antagonist Satsuki.
The First Slam Dunk which I see you’ve already seen, but leaving it here for others. BanG Dream! It’s MyGO!!! takes a long time for a leader to emerge and I hated it for the first ~9 episodes but the birth of hope and vision and confidence is so amazing that it’s worth the maximally melodramatic early stretch. You’ve also already seen it 👋🙄