That's my question for all manned exploration of space.
Every manned mission must be a round trip while robotic missions can be one-way. That allows them to provide dramatically more return for the investment. Imagine putting 100 tons of aircraft and science laboratory on Mars. We can stop this whole nonsense of sending a few kilograms of samples back to Earth for billions of dollars and instead just analyze them right on Mars. We can take a page right out of science fiction and come up with standard science probes that we can land at various destinations. Drop one on every body with an accessible surface and geek out on the data.
So all my early Starship missions would involve robotic visits to various and sundry places. Science probes first, then get to work on using local resources. Build fuel depots and refined stocks of other materials such as iron, aluminum, etc. All of that would be created using standard industrial landers (as standard as conditions allow). Later on, start building big rotating habitats from those stocks. Start with one in orbit around the Moon, using Moon resources. The next one can be in orbit around Mars, using Phobos or Deimos. Patch with resources from Mars if the moons are missing anything needed.
Once a station is in place, send out organic material from Earth. Soil, plants, insects. Start with a basic ecosystem and build on that. The goal is to get these things to the point where people can visit and even live there for extended periods in a safe, shirtsleeve environment. Sending people out to live in zero g tin cans is not tenable for the long term. It's just prestige crap.
Note that I consider even the rotating habitats dumb, but people want to be out there, so that's how I'd do it. Why dumb? For philosophical reasons. We can live happily and comfortably on Earth if we'd just get our act together as a species. We don't need to have 7 billion people at each other's throats (with a desire for billions more on other planets). We could live with a few hundred million of Earth's finest, and automate the crap out of everything we need. Just avoid pumping out billions of people and you're golden. Is anyone truly disappointed by the fact that we don't yet have 100 billion people in the solar system?
Not that it'll happen, but that's my wish.