there is currently no known technology or method that would allow humans to travel between star systems within a reasonable timeframe without utilizing some form of time dilation or time travel. The vast distances between stars, even within our own galaxy, make interstellar travel incredibly challenging with our current level of technology.
To give you an idea of the scale involved, the nearest star system to our solar system, Alpha Centauri, is about 4.37 light-years away. This means that light, which is the fastest known thing in the universe, takes over four years to travel that distance. The fastest spacecraft ever built by humans, such as the Voyager probes, would take tens of thousands of years to reach even the closest stars.
To overcome these immense distances, scientists and researchers have proposed various theoretical concepts, such as utilizing advanced propulsion systems, such as nuclear propulsion, ion drives, or even concepts like warp drives or wormholes. However, these ideas are still purely speculative and purely theoretical at this point, with numerous technical challenges and unknowns.
It's important to note that scientific progress is ongoing, and new discoveries or breakthroughs may change our understanding of the universe and what is possible in the future. But as of now, interstellar travel without the use of time dilation or time travel remains firmly in the realm of science fiction.