don’t hire management externally. search loyal long time staffers who want to be promoted. don’t just promote them; make sure they want that change in their tasks.
some employers think promoting staffers to management removes a person who is good at their job, but some become fed up and bored and will leave anyway, so might as well promote them. signs are, when they ask to work in a different department/position; it means they are loyal and want to stay, but are bored/frustrated with their current tasks.