Every argument needs to be there to improve understanding.
What is the premise about free will that we have doubt on. Let us try to look at it with a different perspective.
Human beings are having the physical hardware required to read the imagination signals from the soul or life atom which gives life to animals also.( We can assume it to be true for now and read else where where I have tried humbly to explain the same.)
Now using the imagination Human beings can create their own percieved reality which is real for that Human being. The purpose of living is to align that with the existential Reality.
The gaps between percieved and existential reality will always be a cause of pain and suffering.
Human being are here to understand Reality and enrich the planet by producing more than what they take out from the ecosystem.
All things before humans have enriched planet Earth by improving quality of stuff to be better than when they consumed.
Hydrogen and oxygen by becoming water paved way for living matter.Plants consume nutrients but create fruits and manure more in value to create habitat for insects and the whole animal world to evolve from amphibians herbivores and carnivores.
Till now Human beings have depleted and now with better knowledge they will be on the path to enrich planet Earth.
Free will alone is the power to give Human beings that direction.