Our Father, who art in heaven, hallowed be thy name; thy kingdom come; thy will be done; on earth as it is in heaven. Give us this day our daily bread. And forgive us our trespasses, as we forgive those who trespass against us. And lead us not into temptation; but deliver us from evil. For thine is the kingdom, the power and the glory, for ever and ever. Amen.

Eastern Christians, borrowing words from blind Bartimaeus, have long prayed the "Jesus Prayer."
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Pray, "Lord Jesus Christ, son of God, have mercy on me [a sinner]."
You may add or subtract "a sinner" as fits your need.

As a breath prayer: inhale slowly and deeply as you pray, "Lord Jesus Christ, son of God," pause briefly, and then exhale while praying, "have mercy on me [a sinner.]