Analyse the problem and trying to find what went wrong by looking at each step and find the root cause of problem, learning on organization culture, pay more attention on staff behaviour and trying to learn something from them is there any hint form staff side.
Changing the leadership style by learning more on organization culture and team because sometime the leadership style is depending on people who that you work with, their background and their style because in some country they may like autocratic style because they do not like to involve in sharing ideas. However, some country they like to work by working together and sharing some ideas to achieve the goal.
Come up with solution and provide the action by changing the plan
Set up the motivation strategy to encourage them to work together.
Put the action in place and make sure that leader continuously monitor the effectiveness for actions