Before prayer, you need to tune yourself to reverence, i.e. think about who we are and Who is the One with whom we want to talk? We are earth and ashes. And He is the Creator of heaven and earth, before Whom the Cherubim and Seraphim tremble... Such a comparison will cause a feeling of contrition of spirit; then cry to the Lord: alas, I am a sinner! And then tell yourself:
Lord, bless me to bring You prayers and supplications to Your mercy for my insignificance.