Repent

Definition: to feel such sorrow for sin or fault as to be disposed to change one’s life for the better; be penitent.

Synonyms: apologize, atone, deplore, lament, reform, regret, relent, sorrow, be ashamed, be sorry, feel remorse

What does the bible say:

2 Chronicles 7:14
If my people who are called by my name humble themselves, and pray and seek my face and turn from their wicked ways, then I will hear from heaven and will forgive their sin and heal their land.

1 John 1:9
If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.