The Dunning-Kruger effect argues that the most competent people are often the most insecure. People who question their abilities are often great leaders because they are humble enough to know there is always more to learn.
Identify these “hidden leaders” on your team. The thinkers. The doers. The ones who pursue challenging tasks. When overconfidence is blinding, you want leaders that see the unseen.
Look for those members filled with doubt and help them find fearlessness in themselves. Give them opportunities to showcase their abilities and they will shine for you.