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Our actions are mediated by our emotions and worldview as well as anatomic realities. Emotions, and the sieve of assumptions we see the world through, determine our actions and therefore our destiny. Everybody can remember the energy and joy during a big positive emotional moment, and its opposite. 'The thrill of victory and the agony of defeat', without free will there's neither.
Medical science has shown with many studies that our emotional state has a huge influence or our physical health and our immune response. Emotions and perspective have leverage, each on the other and each on the result. Positive emotions are generated by a positive perspective which is often the product of successful outcomes especially those won by free choices. Free choices are choices taken independently by a 'chooser'. Free will is our one independent freedom, if we exercise it, like Arnold's arms, it'll grow and there will be more happy people ready to eat the happy buffalo...
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If letting the buffalo roam isn't your top priority yet maybe exercising your free will muscle might be. The flame of free will is extinguished by the depression of dependence be it individually or across the wider culture.
co-dependents in a culture of dependence...manana