The easiest way to solve the riddle of free will, is with the notion of two centers of consciousness. Conceptually, if we had two centers of consciousness and both centers had their own determinism; two sets of determinism pulling or pushing in opposite direction, then all determinism will stall, like the rope in the tug of war below. If we have two forces, pushing/pulling a wall in opposite directions, all movement stops, even though we will expend lots of mental energy.
What remains, above, is tension in the rope, or compression at a wall, as the case may be. This builds up potential, like damming a stream. This obstruction impacts the second law; entropy has to increase, but now it is not. This can lead to a creative solution, that may not be deterministic to either program, until it becomes accepted by both, as part of the new potential lowering routine.
In the other case, of two opposing forces
pushing a plane and the plane not moving, say they both shift, one to the left and one to the right. Now the stagnation becomes a rotation of the plane. This rotation may not have been possible, with either determinism, all by itself.
The current assumption is we only have one center of conscious, that is partially conscious and partly unconscious. This would conceptually lead to only determinism, since one may not be aware of the whole single deterministic package; one big force. For example, the young person driving a car, may only know about the superficial workings of the car; ignition, radio, steering wheel, brakes and gas. The entire experience involves things, like the engine, that the teen is not aware of. The unconscious things are still part of the full deterministic experience. He may ask what is that noise on my newly installed radio. I can make happen, if I play the radio too loud? Lack of grounding is part of the full package.
Once you add two separate layers of conscious determinism; innate instinct versus learn knowledge; these two forces of human nature can cancel and cause all determinism to come to a halt. The ancients, like in the Bible, by saying humans have free will and choice, logically implied a secondary center had appeared, to counter the primary determinism of natural instinct.
It is basic physics. Determinism is like a force, while a secondary force, can counter or deflect the initial deterministic path, even if the first force and its vector, are sustained. If we have one force, this is not an option.
Projectile motion on the surface of the earth, curves back to the earth, due to the downward pull of gravity. Natural determinism would be like the red gravity free path; high road of nature. The ego determinism of learn knowledge is like the gravitational force for a downgrading path; lower road of learned human nature. Gravity lowers entropy. The blue path is the product of these two determinisms, with this middle path not the deterministic product of one or the other, but the result of a two member team. This can, over time, alter nature and/or make the artificial more natural; new cooperative determinism added to genetic based human nature.
Say we use the blue line force vector. This compromise determinism; more domesticated, is now in our human DNA; effect of long term compromises. We can use that blue force vector, to defect the gravity free path of natural instinct, less. This will get us a purple path, not shown, that is even closer to eternal natural determinism. However, the change to full purple average determinism, may take time before it is engrained in our human genetics. For now, this hypothetical purple determinism is subject to free will and choice, since not yet our second nature.