Yeah I have to agree with you there, Levi has suffered serious injuries and most characters who suffer that kind of injury would usually die within the world of attack on titans but he survived! And I feel like the only reason he did was because since Erwin’s death Levi’s sole and end purpose was to kill the beast titan. I feel like he has survived because his character arc will be rounded up and end once he has killed Zeke because it would be a good ending for his character, to see him complete his final mission which was set by his commander and best friend.
And in my opinion most of Annie’s development tends to evolve around her father or her promise to get back to her father. Even though it would seem unrealistic I think she will see him again even if it’s when Eren is attacking. I feel like Isayama will let them reunite even if it’s just before her father’s death.
But to be honest who knows at this point anything could happen.