If you were to travel in outer space forever, it is theoretically possible to reach another galaxy, but the likelihood of doing so within a human lifetime is incredibly slim. Interstellar distances are vast, and galaxies are typically separated by immense empty space.
Our own Milky Way galaxy, for instance, has a diameter of about 100,000 light-years, meaning it would take light 100,000 years to traverse from one end to the other. Even if we imagine a hypothetical scenario where you could travel close to the speed of light, which is currently beyond our technological capabilities, it would still take an enormous amount of time to reach another galaxy.
Furthermore, the universe is expanding, causing galaxies to move away from one another. This expansion makes it even more challenging to reach distant galaxies. The rate of expansion is faster than the speed at which we can currently travel through space, which means that over time, galaxies will become increasingly distant from us.
In summary, while it is theoretically possible to reach another galaxy by traveling through space indefinitely, the enormous distances and the expansion of the universe make it highly improbable to achieve within a human lifespan or even many lifetimes.