Please don’t think me presumptuous, but rather a older soul brother in Christos.
Holy scripture, Matthew 6:7 says: “But when you pray, use not vain repetitions, as those who are of the nations: for they think they shall be heard through their repetitious words.”
However, to pray without ceasing, is by the Holy Spirit who guides prayer so if you find yourself praying a written prayer over and over like “Lord Jesus Son of the Living God, have mercy on me a sinner,” don’t fret.

Nothing beats Holy Scripture (aka Tanakh both old & new covenants).
Psalm 69:9 says: “Zeal for your house consumes me Adonai” (Adonai = Lord). To experience a constant presence of zeal for the Most High x 3 (Trinity) is living prayer through grace.
Something we rarely hear of, or to my knowledge isn’t often said refers to circumcision of the heart which occurred for the first time in the New Covenant between Elohim and his people Israel (which believers are grafted into) when the Holy Spirit appeared upon the Apostles as tongues of fire on Pentecost. Here are a few quotes relating to circumcision of the heart:
Jeremiah 4:4 Circumcise yourselves to the Lord; remove the foreskin of your hearts, O people of Judah and inhabitants of Jerusalem; lest my wrath go forth like fire, and burn with none to quench it, because of the evil of your deeds.”
Deuteronomy 30:6 And the Lord your God will circumcise your heart and the heart of your offspring, so that you will love the Lord your God with all your heart and with all your soul, that you may live.
Philippians 3:3 For we are the circumcision, who worship (pray) by the Spirit of God and glory in Christ Jesus and put no confidence in the flesh.
1 Thessalonians 5:16-18 Rejoice always, pray without ceasing, in everything give thanks; for this is the will of God in Christ Jesus for you.
More and more we find the remnant of Spiritual Israel is withdrawing from the world at large to meet their Daddy–ABBA–in prayer because zeal for his house consumes them. All is met and great grace abounds.
However, there are times of dryness when it seems the Ruach of Elohim has abandoned us. But he is even closer than before during this silence. Such silence–when we persist in prayer–develops us as the Holy Spirit (Ruach of Elohim aka Ruach HaKodesh) refines us and teaches each of us what we specifically require.
John 16:12-15 “I have much more to say to you, more than you can now bear. But when he, the Spirit of truth, comes, he will guide you into all the truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. He will glorify me because it is from me that he will receive what he will make known to you. All that belongs to the Father is mine. That is why I said the Spirit will receive from me what he will make known to you.”