Question: What needs to happen within us and between us for our prayer to become correct? I would like to know what state we are in when our prayer does not reach the Creator.

Answer: It lacks caring for each other. This is not an easy action because we need to replace our own hearts with those of others.

Suppose there is a friend who involuntarily thinks only of himself. And there is you, who also involuntarily thinks of yourself. How can you exchange desires so that each one thinks in his heart, not of himself, but of the other? You need to think about this carefully. Perhaps you will find a solution.
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From the Daily Kabbalah Lesson 4/16/24, Writings of Rabash Letter No. 48

Related Material:
One Common Heart Directed to the Creator
Directed Straight to the Creator
Everything Starts From the Connection of the Hearts