Believing that you can do something is not only 50% of the battle, it also is 60% of the planning, and 90% of the victory. When you believe, you can transform the ether so that it becomes more conducive to the flow of abundance from God to you. That flow is in constant motion; it never stops, nor can it be curtailed.
When you are in a state of lack, it always is because the flow has been redirected away from you. Ask the Lord God Almighty to maintain it in your direction, and to prevent the devil from redirecting it away from you at any time, now or in the future. Ask him to redirect it to you daily, from now until the end of all eternity. Then ask Jesus to do the same, and ask him daily.