Everyone has the potential to improve, and with a growth mindset, we also have the ability to.
However, in order to identify what to work on, it's beneficial to get some outside council as it can be difficult and even painful to identify and address our own weaknesses.
As a team leader, your interaction with team members and observations of how team members interact with eachother puts you in a great position to identify weaknesses.
Use this insight to carefully and considerately communicate to your team what they might benefit from improving in, and discuss how you can help them address the obstacles they experience.
If you are unfamiliar or uncomfortable identifying and addressing weaknesses on an ongoing basis, you might find it useful to associate a weekly, recuring allocation to this responsibility and use the My team view as a tool to reflect on the potential of individual team members.