If you were to travel between galaxies in a spaceship, you would indeed experience a significant reduction in the number of visible stars. This is primarily due to the vast distances between galaxies and the distribution of stars within them.
In the vast expanse of intergalactic space, the density of stars is much lower compared to within a galaxy. While our own Milky Way galaxy contains hundreds of billions of stars, the space between galaxies is relatively empty. This means that as you move away from your own galaxy, the number of visible stars would progressively decrease.
Additionally, the farther you travel from a galaxy, the less light reaches your spaceship. Light diminishes with distance due to the inverse square law, which states that the intensity of light decreases proportionally to the square of the distance. Therefore, as you move away from any given galaxy, the overall brightness of the stars diminishes.
However, it is important to note that even in intergalactic space, there are still individual stars, nebulae, and other cosmic objects that may be visible. Additionally, galaxies themselves emit light, so you would still be able to observe the glow from nearby galaxies, albeit with fewer discernible individual stars.
Ultimately, the experience of traveling between galaxies would be a journey through vast expanses of darkness, with fewer visible stars compared to what you would observe within a galaxy.