What do you think about these ideas:
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First idea: If you become an astronaut you can discover a potentially habitable planet (to be 100% sure, you’d need to study it for years using probes, telescopes, research teams, etc.), and then find out humans can live there, you could launch a mission to bring humanity to that planet (the mission would need to be carefully planned and would only be possible if you have the required rank). Depending on the planet, humans could evolve slightly differently over time. It would also be cool if you encountered aliens there — they could be hostile, friendly and willing to exchange knowledge, or they might simply avoid humans.
Second idea: Custody battles & children of divorce: If parents separate, it could either be randomized or decided through court who you live with. This would affect your yearly allowance, school life, free time, and things like a sports career if you play on a local team as a child/teenager. It would also impact your ability to move and how often you can see the other parent (including loyalty conflicts between parents).