I've seen the culture changing in some special circumstances a couple times in previous companies, and honestly all of them were ugly: 1) Demographic replacement (having more people saying yes and out-vote the legacy employees)
2) Hired guns from the top to the bottom to shake the system (we called in a company those managers "007" because they used to have licence to fire).
3) Non-compliance stable as a discipline method for the "legacy employees" (very adopted in Central Europe)
4) "Train-your-replacement" as a coercion method for collaboration
5) Some modified version of the "madogiwa-zoku" but instead of looking to the window, they push people to go for the "metawork," like organizing events, being a developer advocate in conferences, assuming roles as "community managers," or being used as a "donkey token" to be used in conferences or panels of "_______________ in tech."