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Read George Polti’s The 36 Dramatic Situations. It’s a list of plot elements that have a snappy title, a list of participants in the plot element, a brief discussion of how it works, and then (unfortunately dated) references to dramas that used them.
Using this when building a world, or a campaign, or a local setting, lets you quickly set up a bunch of conflicts (ideally with interlaced participants so that single NPCs (or PCs) can be in different roles in different dramatic situations. Then you just let the events flow logically, and as the dramatic situations get resolved you get a plot. PCs can interfere with these dramatic situations and thus have an impact on resulting plots even if the overall setting is far larger than they are.
The Apartheid Manchild has this weird obsession with Mars.
There will be no permanent settlement on Mars in the next decade. (I frankly doubt that there will even have been human footprints on Mars in the next decade!) There will be no permanent settlement on Mars in the next century. There will likely be no permanent settlement on Mars in the next millennium. And I’m saying that last one not because I don’t think we’d have the technology in a thousand years, but rather because there is no point in living on Mars.
Mars has nothing we need that’s worth maintaining a settlement in the face of conditions harsher than the absolute worst the Earth has to offer. If people want to live in a permanently cold shithole with nothing usefully accessible they can just build a house on Antarctica. It’s a far cheaper way to fuck around and find otu.