We don't have anywhere near the engine technology to make it anywhere worth going to in 400 years. That's orders of magnitude more difficult.
Anywhere that might sustain life is no closer than a couple thousand years away if we develop ultra-efficient almost magical engines that only bend the laws of physics instead of breaking them outright. Stuff like accelerating the propellent so hard that it picks up enormous amounts of relativistic mass, like every gram of propellant weighs effectively a ton because you've accelerated it so close to the speed of light, which requires some kind of ultra-dense power source that makes mere matter-antimatter annihilation look like burning a match.
Anywhere that might sustain life is no closer than a couple thousand years away if we develop ultra-efficient almost magical engines that only bend the laws of physics instead of breaking them outright. Stuff like accelerating the propellent so hard that it picks up enormous amounts of relativistic mass, like every gram of propellant weighs effectively a ton because you've accelerated it so close to the speed of light, which requires some kind of ultra-dense power source that makes mere matter-antimatter annihilation look like burning a match.