Alignment in your culture is dependent on your skill as a leader, not people's willingness to "buy-in".
Posters won't create production. It doesn't matter how well you've written your mission, vision, and values.
Documents don't build culture—people do.
Declarations don't build culture—discipline does.
It is a leader's job to create culture. It is a leader's job to equip people with strategies and skills to compete and win. It is a leader's job to earn trust worth following.
Stop asking for buy-in and start leading a culture worth buying into.