You know this, the way we used to manage businesses is woefully inadequate in our fast-moving and complex world.
When you found the Agile and Lean toolset and started implementing Kanban you had great hope that "everything" would soon change.
Unfortunately, even you, greatly underestimated the true villain in the story: management inertia, or the tendency to keep managing in the same way that worked before.
To break outdated habits, you can't just read a "how to book" or do a quick course. No, you need to systematically upgrade your own mental framework. Not enough, you also need to help everybody else you work with do the same.
If unsuccessful, any momentum you have built will soon be lost again as inertia reasserts itself.
But this unfortunately takes time. Even more time if you want to drive this on your own. Time which you probably don't have, as you need to attend to the next 4 big initiatives …