But what causes the motion?
We don't yet have a complete understanding of what causes motion, although lots of existing theories are extremely good at approximating motion of particles to a very good accuracy. Most theories require a "singularity" at the beginning of time, or more commonly, "The Big Bang".
If you trace all the equations of motion back to the big bang, then... well there are different theories of what caused the big bang. One of the most common views is God. There is the multiverse theory. There are also lots of other theories. If you now want to ask what caused the very first thing - without cause - then maybe you are talking about God or whatnot - but that is more of a philosophical discussion than a scientific one.
But anyway, energy isn't an an actual little piece of electric bolt that makes things "fired up"* or some handwavy bull, the term "energy" itself is just a useful quantity from equations of motion.
*Although this is sometimes a good way of visualizing what energy is, solely for intuitive purposes imo