"And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not.". - Jonah 3:10
Nothing is impossible, above verses says that God repented and changed His mind not to punish the people of Nineveh. Jonah 3: 5-19 says that all the people of Nineveh fasted and prayed. Unique thing is even animals were also made to fast by King's order. God heard their prayer and forgave them.Even our life may be in a difficult situation, so that no can help, or change our life, with our own effort we can do nothing. But when we earnestly seek God, fast and pray, God will change our life, he will bless us beyond our imagination, He will counsel us and lead us in path of righteousness. Let God give us grace to sincerely seek Him.
"And God is able to make all grace abound toward you; that ye, always having all sufficiency in all things, may abound to every good work:" 2 Corinthians 9:8