Trust and respect. Encourage team members to share their thoughts and feelings. And everyone should feel safe discussing controversial topics. It does not take time to experience disengagement in team dynamics. Employee engagement is all about creating a psychologically safe work environment. Another key factor is providing clear guidelines about handling conflicts within the team. You should provide a fair and unbiased way to resolve disputes and encourage team members to take any feedback constructively. Finally, supportive leadership ensures recognition of individual contributions, fosters collaboration, and celebrates successes together.  It will help team members feel appreciated and motivated to continue working together. It brings out the full potential of the members of a team armed with good mental health, honesty, and agility. Check out this journal article from APA psycNet.