@Celesdriel I suggest you add another sim into the household and let that sim complete the early stages of the storyline and accumulate a new keycard, etc. Then switch back to your sim to finish the aspiration for that sim. You can then either keep the new sim or split them into a new household or delete them.
@Celesdriel If you play with mods, MCCC has an option to reset a sim's aspirations back to the initial state so you can start over. But you don't get to pick and choose. It resets all of them, not just the one you may want to reset. It's not perfect as there is a side affect. I haven't tried using that option so I'm not sure what will happen but there is a message on having to change zones to see the effects, etc. But it is a way for you to reset your sim. I would recommend though that you make a copy of your saves folder and put it in a safe place before trying it though just in case.
