The confessional solution to the repeated failure was one path to take. It seems that many of his fellow believers adopted it, as they stayed in Jerusalem and frequented the Temple, presumably making the sacrifices. But St Paul glimpsed another possibility. Rather than show himself to the priests, he turned towards a more radical freedom. He stopped worrying about himself.
He let his failures be. He accepted his weakness. He embraced his thorn in the flesh. He adopted the daily task of dying to himself so that he could be reliably open to an inflow of the deathless life of God.