Davening with kavanah is not easy. It doesn’t come naturally. It doesn’t come without effort, and learning, and prayer (about prayer).
I’ve found some of the teachings of Breslov chassidut (as collected in Likutei Eitzos, all the collected practical advice from Rebbe Nachman’s works) to be helpful in this regard. He has a number of suggestions for achieving kavanah in davening, and also places great emphasis on the importance of hisbodedus, or personal prayer in one’s own words, as a daily supplement to the required prayers.
If you Google “As soon as a person stands up to pray, he is immediately surrounded by extraneous thoughts” and “pour out your heart like water before God,” the relevant chapters will come right up.