Answer:
The best prayer to compose for God to give you strength in moments of challenges/crisis in life is your own prayer. With your own prayer you can express more your true feelings to God rather than recited prayers.
Example:
Heavenly Father Lord God, I pray for you Lord to help me in my of challenges of life. Challenges might be hard like sometimes its impossible to outcome but I believe Lord God that you'll help me in this challenges to be done. I have high faiths in you Lord.
Amen.
