Relationship relationship relationship.
I have a strong bias, maybe because my life is revolved around relationship.
*And* I see strong cultures attracting strong talent, great people, and a collective motivation when:
...Relationship becomes the tool and the goal.
What does this mean? Beyond financial and emotional pressure, people are strongly motivated by exercising potential, purpose, and play, and how they can demonstrate that is within relationship. When better relationships in the work environment becomes the goal (and the communication/collaborating to reflect that), more people are motivated to show up as their best. When relationships are built, retention is higher, and there is no cause for talent to look elsewhere.
How? Build context and intention. Understand why your employees are working --- their true motivations, not the stock answers that makes their employers happy. Encourage trainings/coaching to improve communications and structures to flesh out the contexts of every given project. Talk about tensions, personal or professional (I think all tension is personal).