One of your affirmations can be used as a mantra. This one serves as a reminder of the source of hope.

Breathing in: Hope is . . .
Breathing out: in God.

Other Prayers

O God, I Need Thee
I Need Thy Sense of Time
Always I have an underlying anxiety about things.
Sometimes I am in a hurry to achieve my ends
And am completely without patience. It is hard for me
to realize that some growth is slow,
that all processes are not swift. I cannot always discriminate
between what takes time to develop and what can be rushed,
because my sense of time is dulled.
I measure things in terms of happenings.
O to understand the meaning of perspective
that I may do all things with a profound sense of leisure – of
I Need Thy Sense of Order
The confusion of the details of living
Is sometimes overwhelming. The little things
keep getting in my way providing ready-made
excuses for failure to do and be
what I know I ought to do and be.
Much time is spent on things that are not very important
while significant things are put into an insignificant place
in my scheme of order. I must unscramble my affairs
so that my life will become order. O God, I need
Thy sense of order.
I Need Thy Sense of the Future
Teach me to know that life is ever
on the side of the future.
Keep alive in me the forward look, the high hope,
the onward surge. Let me not be frozen
either by the past or the present.
Grant me, O patient Father, Thy sense of the future
without which all life would sicken and die.
Howard Thurman in Conversations with God: Two Centuries of Prayers by African Americans

The Buoyancy of Hope
And now unto Him who is able to keep us from falling. And now until him who is able to lift us from the fatigue of despair to the buoyancy of hope. And now unto Him who is able to solve the race problem if we will cooperate with Him. And now unto Him who is able to transform this cosmic energy into constructive force. Now unto Him who is able to transform this midnight of injustice into a glowing daybreak of freedom and justice. To Him be power and authority, majesty and dominion, now, henceforth, and forever more.
Dr. Martin Luther King, Jr. in Thou, Dear God: Prayers That Open Hearts and Spirits