Contents of composure

(more than anything else, keep your composure)

• a calmness or repose especially of mind, bearing, or appearance
• self-possession
• let all the distresses come, but your calmness of mind, your bearing, your appearance - your composure - remains intact. That’s composure.

Let people be able to say of you, “she never loses her composure,” that is, you’re always calm.