We should always repent and seek forgiveness from Allah. Allah is most merciful and forgiving. He is always read to forgive us.
Some Dua quotes from Quran are as follows:
“Praise be to Allah, who has guided us to this (felicity), and we would never have been guided if Allah had not guided us.” – [Quran, 7:43]
“Our Lord, forgive me and my parents and the believers on the Day the account is established” – [Qur’an 14:41]
“O my My Lord, indeed I am, for whatever good You would send down to me, in need.” – [Quran 28:24]
“My Lord! Bestow wisdom on me, and join me with the righteous.” – [Qur’aan: 26:83]
“My Lord, enable me to be grateful for Your favor which You have bestowed upon me and upon my parents and to do righteousness of which You approve. And admit me by Your mercy into [the ranks of] Your righteous servants.” – [Quran, 27:19]
“Our Lord, Grant us good in this world and good in the hereafter and save us from the chastisement of the fire.” – [Quran 2:201]
“Our Lord (Allah)! Accept (this service) from us, verily! You are the all hearer, the all knower.” – [Quran, 2:127]
“Our Lord(Allah), and make us Muslims[In submission] to you and from our descendants a Muslim nation[in submission] to you. and show us our rites and accept our repentance. Indeed, you are the accepting of repentance, the merciful.” – [Quran 2:128]
“Our Lord, Punish us not If we forget or fall into error.” – [Quran, 2:286]
“Our Lord, and lay not upon us a burden like that which you laid upon those before us.” – [Quran, 2:286]
“Our Lord, and burden us not with that which we have no ability to bear. And pardon us; and forgive us; and have mercy upon us. You are our protector” – [Quran, 2:286]
“Our lord, let not our hearts deviate after you have guided us and grant us from yourself mercy. Indeed you are the bestower.” – [Quran, 3:8]
“Our Lord, surely thou art the gatherer of men on a day about which there is no doubt; surely Allah will not fail (his) promise.” – [Quran, 3:9]
“Our Lord, indeed we have believed, so forgive us our sins and protect us from the punishment of the fire.” – [Quran, 3:16]
“Our Lord! We have wronged ourselves. If you don’t forgive us and have mercy on us, we shall certainly be of losers.” – [Quran, 7:23]
“Our Lord! Forgive us our sins, remove from us our evil deeds and makes us die with the righteous.” – [Quran 3:193]
“Our Rabb, We believe in you; please forgive us and have mercy on us, for you are the best of those who show mercy.” – [Quran, 23:109]
“My Lord, I have indeed wronged my soul, so please forgive me.” – [Quran, 28:16]