Fortification of the Muslims through remembrance and supplication from the Quran and the Sunnah Supplications
رَبِّ اغْفِرْ لِي ذُنُوبِي وَافْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
"O Lord, forgive my sins and open the doors of mercy for me". (Mishkat)
Alternatively recite
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
"O Allah, open the doors of mercy". (Mishkat)