As he chronicles one tenacious man’s fight to survive after a nuclear holocaust decimates life on Earth, a dedicated and determined alien observer must decide whether to obey or defy orders to terminate humanity.

As he chronicles one tenacious man's fight to survive after a nuclear holocaust decimates life on Earth, a dedicated and determined alien observer must decide whether to obey or defy orders to terminate humanity.

Same thread for the story, different approach.

Inciting incident -
According to your last post the inciting incident is the destruction of Earth by man kind. This is not a good inciting incident as this takes place over many centuries as a result of many actions and events.

Where as an inciting incident needs to be a single event done to the main character by a force other than them selves.

Hero -
According to your last post "...one troubled survivor?" will be the main character one is implicit in the description no need to mention it.

Troubled is a generic none specific description that doesn't describe a character flaw that will present an obstacle for the MC to achieve his goal. Almost all characters are troubled from Vito Corleone to Wayne Campbell question is, in what way is your character uniquely troubled that works best for this story?

Goal -
According to your last post the MC "...must convince them spare mankind and secure their future as a species?"
As a rule of thumb I normally say if I can't describe the MC's goal in less than three words it isn't a good goal.

How will he convince a whole department of alien scientists? More importantly what will this look like? A camera will have to show this goal being achieved but how exactly?
Will he hold a summit and have lengthy discussions with the observers department heads? I just can't see the climactic scene at the end of act 3 from this.

If he were to need to kill the alien leader who is an anti homo-sapien then the climactic scene will be just that. Otherwise to see a man try to convince a bunch of aliens that humans are good doesn't sound cinematic, compelling or achievable in 110 minutes with a camera.

Stakes -
According to your last post the stakes are that "...alien observers are ordered to halt a 100,000-year experiment?" i.e do one thing, then "...collect viable specimens?" do a second thing, then "...terraform the planet?" do a third thing.

Which is it that most impacts the main character? Which will be his motivation?
Because there are several actions the aliens are ordered to take the plot is unclear because it isn't explained what exactly the MC will be doing in the story.

When mankind destroys their planet (main event), alien observers are ordered to halt a 100,000-year experiment they have been running, collect viable specimens from the human survivors and terraform the planet (stakes), one troubled survivor (hero) must convince them spare mankind and secure their future as a species (what he must do).