Answer:
We are all responsible for our own destinies.
Explanation:
Our destinies depend on the decision we make, if we make a decision we cause a chain reactions from the decision we made. Only you can form your destiny,there are many destines a person could have but we have to make a decision to start that destiney.
I would say isolation because Elie and his father are separated from his mother and 2 sisters so that he and his father go to the forced labour camp and his mother and sisters go to the gas chambers though the mother and one sister survive he does not see them again, at least not there. And seeing his father become helpless so that he must become his father's caregiver makes him resentful and then ashamed of his resentment.
Careful is already a adjective so keep that.
There are many adjectives for change but what suits the best here is “changing”.
Careful changing is the best I could find.
Hope that helped