As has been pointed out a) leaders matter, b) the difference in impact between great and mediocre/poor leadership is massive, c) even if you hire a great leader you can get poor results.
It follows then that spending more effort to find just the right person is not enough. You must also examine your overall organizational culture, your investors culture, your unspoken assumptions about the goals of your organization, etc etc.
And yes great leaders do all of this - of course - it becomes obvious upon reading my comment. But the point is great leaders doing this is not enough. The organization must be on the same page. You can lead a horse to water etc etc. And yes the leader can "Re-organize" but at that point you may find yourself faced with throwing the baby out with the bathwater unavoidably.
Leaders are necessary. And hiring is hard. But there is no one golden calf like "hire the perfect leader" that will solve a problem.
As with most things worth doing: you have to do it. Doing it is hard. And you might still not get the results you want.