Regardless of whether there is such thing as free will or not, philosophy (reflection, intelligence, insight) will improve our life.
"Someone will say, "What use is philosophy to me if there is fate? What use is it if God is in charge? What use, if chance has the mastery? For what is certain cannot be changed, and against what is uncertain there is no way to prepare oneself. Either God has preempted my planning and decreed what I should do, or fortune has left nothing for my planning to achieve." No matter which is true, Lucilius, or even if they all are, we must still practice philosophy. Perhaps the inexorable law of fate constrains us; perhaps God, the universal arbiter, governs all events; perhaps it is chance that drives human affairs, and disrupts them: all the same, it is philosophy that must preserve us."
'William James simply asserted that his will was free. As his first act of freedom, he said, he chose to believe his will was free. He was encouraged to do this by reading Charles Renouvier. In his diary entry of April 30, 1870, he wrote,
'"I think that yesterday was a crisis in my life. I finished the first part of Renouvier's second Essais and see no reason why his definition of free will — 'the sustaining of a thought because I choose to when I might have other thoughts' — need be the definition of an illusion. At any rate, I will assume for the present — until next year — that it is no illusion. My first act of free will shall be to believe in free will."'
(The Thought and Character of William James (Boston, Little, Brown, 1936) vol.1, p.323)
I like how James handled the question.
'William James simply asserted that his will was free. As his first act of freedom, he said, he chose to believe his will was free. He was encouraged to do this by reading Charles Renouvier. In his diary entry of April 30, 1870, he wrote,
'"I think that yesterday was a crisis in my life. I finished the first part of Renouvier's second Essais and see no reason why his definition of free will — 'the sustaining of a thought because I choose to when I might have other thoughts' — need be the definition of an illusion. At any rate, I will assume for the present — until next year — that it is no illusion. My first act of free will shall be to believe in free will."'
(The Thought and Character of William James (Boston, Little, Brown, 1936) vol.1, p.323)
Source: https://www.informationphilosopher.com/solutions/philosophers/james/