We also find that during Chanukah, the gates of teshuva are open and everyone can draw close to Hashem through full repentance. Sefer Pri Tzadik writes that everyone can rectify their ways on Chanukah and completely purify themselves.
At this time, one only needs to make a small opening, like the eye of needle, to allow Hashem into his life, and Hashem will help him to do full teshuva and transform his aveiros into merits.