The question of free will is really fundamentally a question of the nature of the universe and the principle of "cause and effect".
So first, consider that principle.
Do you believe it is possible for anything to happen WITHOUT some form of root cause ?
Can something just spontaneously happen just like that? Without a cause?
I find it difficult to believe or understand that it could. It is not the nature of the universe.
When we roll a pair of dice, our minds generally can not comprehend the infinite number of factors that are in play and so to us the throw appears "random".
But our intelligence and common sense tells us that from the moment the dice left our hands, the outcome was sealed at that point. The dice just followed the laws of the universe and their direction and eventual outcome were the result of lots of factors that were present in that time and space . . .
The angle the dice were thrown at
the speed they were thrown
their orientation when they were throw
the ambient temperature of the air
the resistance of the air
the hardness of the table they were thrown onto
the force of gravity
these are just a handful of the millions of factors in play.
So the outcome was merely the result of all those initial causes and factors.
Given EXACTLY the same factors in play at EXACTLY that same time and space, the outcome would be the same every throw.
What this means is that NOTHING IS RANDOM.
Nothing at all.
Everything is already in motion and all the gazillions of factors are in play exerting their influence on everything.
For every action/effect there is are millions of underlying causes.
Once you accept and understand that you realise that there can not be "free will".
We are not outside of this universe, we are inside it, we are a part of it. We are subject to the same rules.
Thus everything we do, we do because of millions of factors . . . millions of causes. What we "choose" is just the result of those causes.
There is then, no free will.
We are simply hapless players, puppets, in the pantomime of life acting according to universal forces. In effect WE are the dice, rocking and rolling our way across the table of life, bumping off each other, stumbling along.
Our outcomes, every single one of them were set and established from the moment the universe began. Our pitiful minds can not comprehend the enormity of the factors involved, the endless domino string of causes that have been going on since time began.
We are just dominoes falling in that pre-determined gigantic universal play set. Billions of years ago the first domino was set in motion and since then an infinite number of dominoes have fallen and continue to fall all around us. It's too big to comprehend. Yet we are aware.
We can instinctively feel how small we are in the universe and that we are not in control of any of it.
We simply react to the forces, factors, causes.
Our fate is already sealed
So no point worrying about anything
What will be will be