The central theme of Yom Kippur is not repentance; it is forgiveneness.
Repentance means regretting who you’ve become. Yom Kippur is about returning to who you truly are. Forgiveness means being embraced for being who you truly are.
Teshuvah, in English, is recovery. Recovering a lost inner self.
On Yom Kippur, we are all in recovery.
Differences between "return" and "recovery"
I would like to point out that in my understanding recovery does not fully express the concept of Teshuva. Since the term recovery has the implication of replacing something that was missing or ruined. For example recovery relating to health or mental health "He was recovering from his sicness or addiction" Or recovering a lost or stolen item.
However the term "return" usually implies returning the same item which was misplaced.
Chassidus explains that even when a person sins his neshama his complete and has complete faith In Hashem just misplaced being trapped and covered by sin. So we don't need to recover or replace something that was missing. Rther to return something that was there the entire time just misplaced.