I will edit the answer after, i just kind of need more info:
is the essay about what makes people mentally strong?
people who went through things to make them mentally strong?
the impact mentally strong people make?
please comment quickly :)
For 1. Available
2. convincing
3. vain
The 'Call to action" statement is where you engage your reader it should inspire, educate, and it should be able to win over the reader to your "Cause".