If at all possible, most prayer ought to be aloud.
It is not always possible or practical. But much of the time if prayer is not aloud, it disintegrates into wool-gathering or sleep.
"I cry aloud with my voice to the Lord; I make supplication with my voice to the Lord."
Psalm 142:1 (Amplified Bible)
One ought to be praying during the day and night, and it isn't always going to be out loud. But there should be an appointed time each day when there is deliberate prayer that flows out of words chosen by the supplicant.
The Lord often speaks through the prayerful words of the Soldier of The Cross. It changes everything.
Start with acknowledging who He is and tell Him what you love and appreciate about Him. The Indwelling Holy Spirit will take it from there.
Do it today