What are our Values? What will we do differently?
By using a really simple template (linked), you can reflect upon how you are going as a team, and then how to improve things for your future.
Discuss and decide what you value as a team, and from that starting position, decide what changes you can make to improve those aspects.
This is a great team-building exercise, and one that creates an opportunity to constantly reinforce what makes your team a great one.