Teamwork falls under the virtue category of Justice. Justice describes strengths that make life fair. They are broadly interpersonal and describe the best interaction between the individual and a group or community.
Teamwork is closely related to 3 other concepts:
Volunteer for activities such as serving as a Big Brother or Big Sister or constructing a Habitat for Humanity house.
Help someone close to you set a goal and then periodically check on their progress.
Start a book club with family members, friends or colleagues. Schedule a time to meet and discuss the selected books.