Make Istighfaar in Abundance ~ Seek the Forgiveness of Allah
A person who says :
أَسْتَغْفِرُ اللَّهَ الْعَظِيمَ الَّذِي لاَ إِلَهَ إِلاَّ هُوَ الْحَيُّ الْْقَيُّومُ وَ أَتُوبُ إِلَيْهِ
“Astaghfirullah al-’Azeem al-lazi la ilaha illa Huwal-Hayyul-Qayyum wa atubu ilaih ”
[I seek the forgiveness of Allah the Mighty, Whom there is none worthy of worship except Him, The Living, The Eternal, and I repent unto Him] … even if he has committed sins as much as the the foam of an ocean, still he will be forgiven.
[Abu Dawud- 2:85/ Tirmidhi 5:569]