"...you are constrained in linear time..."

Time is not separate from space. Neither time nor space exist separately. Spacetime is what actually exists. We cannot go back in time without creating negative space, which is obviously not something that can exist.

"The whole movie exists."

Yes, but that doesn't matter to us who are within the movie. We can't step outside of spacetime to edit things, and it can't be edited anyway because it is a whole, which is why we can't step outside of it. Because it is one thing there is nothing about it that can be changed. There is no negative distance. There is no backwards in time. The universe isn't assembled from pieces that can be picked apart and put back together, but emanated as a gestalt that has evolved over the aeons and vast expanses as a whole, each bit we perceive individually intrinsically linked to every other bit in a manner we do not perceive. We can't even conceive of the whole in action, much less perceive it. We are ridiculously too tiny and finite to have such capability. We have to break things into chunks to rationally understand them, and there's too many chunks to do that with the whole universe, at least so far, collectively.

We manage to do that with some small local things, tiny bits of matter on a tiny little planet in a tiny little galaxy, but that is utterly irrelevant to the actual extent of the whole we can only guess at. What is red shift and what does it tell us? This very fundamental property of reality is still unresolved. We can't really test it by going somewhere far away. We can hardly get off this planet. Lots of people make lots of guesses and try to formalize the rules and reasons for red shift, but there remains disagreement about what it is and what it tells us for very good reasons, because we can't really sort these things out from here, with our pitiful capabilities, at least not yet.

"...you could change the direction of your movie."

No. There isn't 'your' movie. You are an aspect of the universe. You can't act without affecting the entire universe, and the entire universe affects your action, just as it depends on the effects of every star, every galaxy, within it. You are a critical part of the whole, just a very, very small one, and you cannot change your contribution to the universe without changing the whole universe, which is clearly above your pay grade. To even consider making a change to the entire gestalt is silly. It's a whole. There aren't pieces of it that can be taken out and put back in.

"Our brain is set up to see time as linear."

Our brains are very crude little calculators. They evolved to enable us to aim a rock at a fleeing prey animal and succeed often enough to survive to breed. We're not evolved to understand the physics of the universe. We're lucky we can tie shoes. Our consciousness doesn't arise from our calculators. This has been proved by showing that single celled creatures - that cannot have brains and neural networks because they are single cells - learn and make conscious choices. These single celled creatures have been shown to participate in human consciousness, as well, which is why we have about as many neurons in our guts as we do in our heads, so our gut fauna can contribute to our intellectual activities.

While you experience a 'you' that is singular, you are in fact a collective consciousness comprising trillions of individual beings. Each of your cells and all the bacteria contributing have an individual consciousness that contributes to the whole. Evolution has enabled all these beings to work together as a whole because that potentiates our action in real time that complex negotiations between all these beings would hopelessly extend and cause us to be incapable of prompt action, or even to act at all.

"...deja vu."

You're mistaking imaginary and hallucinatory experience for real things. We have an irrational hubris that causes us to greatly overestimate our capabilities. Just because we can have a thought doesn't make that thought true or reflective of reality. Experiencing deja vu isn't jumping through time. It's irrational imagination. If we don't realize we're full of it, we're incapable of being reasonable, and our beliefs are a good expression of irrational hubris and unreasonable expectation of competence to grasp things we are incapable of understanding.

"When you realize how time really works, you can go back in time and change it so that your child had good parents (re-parenting) and even more fantastic, you can change your life to a completely different time-line."

No, you can't. If I was wrong you could prove it to me by changing my circumstances, which you can't do. You're literally just imagining things. Sorry. You're a pitifully infinitesimal speck of goo in an universe that far exceeds your capacity to conceive. So am I. I've just had to wrap my head around that because traumatic events forced me to recognize my incapacity or abandon reason and the real world, and likely do something silly enough to kill me. I barely managed that and survived. It is what it is. Just because your glands pulsate, ooze a little goo, and you have a feeling doesn't mean anything about the universe. We are matter in spacetime, and can't step outside of it. We are an intrinsic part of the universe, which is a whole and cannot be broken into subunits, not some kind of magical wizards or masters of reality. We aren't designed to understand physics, the fundamental structure of the universe. We're designed to bash things with rocks so we can eat them. That functionality avails us glimpses of what is above our pay grade, but unless we diligently apply the requisite reason to work out these rules that underlie reality we can't arrive at understanding what that is and how we fit into it. We don't grasp physics intuitively. We grasp rocks and sticks intuitively with our little hands. The best we can do is a lot of math to understand how these things function, and math is just a language that we can lie in just as well as we can lie in any other language. This self-deception prevents us from having a good understanding so far, because we keep confusing our misstatements for reality.

We cannot change something in time without changing it in space, and vice versa. This demonstrates that neither space nor time exist separately, but spacetime is what exists. This isn't intuitively naturally understood, because we're not evolved to intuitively understand physics beyond the simple, local effects of manipulating matter necessary to successful reproduction of a living creature.

Thanks!