Um, acktually, we should build long-term Lunar and Martian habitats underground (lava tubes would work nicely) to protect from solar and interstellar radiation.
It's so ridiculous. We can do that at home. There's literally no point in living in Mars. No air no gravity, no radiation protection. Even if we make the air here radioactive and the water poisonous, at least there's air and water.
We need that terraforming exercise to eventually leave the solar system though. Stars don't live indefinitely. But we probably have to grow up first and try in a couple of centuries.
I love space exploration for science, but living in Mars makes no sense, sorry. Even in the solar system there's better places to settle. Heck, even venus is better.
I'm on board with 'living on Mars makes no sense' at least until we really run out of space here, but we have much more pressing issues before that.
But I doubt Venus being more suitable. The high atmospheric temperature of Venus (~460°C) is pretty harsh and it is much more easy to heat than to cool stuff down. The high pressure also makes getting there difficult with the hard entry. Mars at least has a similat rotation period to earth.