That's exactly what you are doing. Seek first the Kingdom of God and His righteousness.You are making a whole salvational argument out of one verse you misunderstand.
In response I can easily say...Romans 3:11 There is no one who understands, no one who seeks God.
God has to give us a free sample of grace to begin with...otherwise we have no idea what we are seeking for. No one seeks God on His own....without the free gift sample.