The 29-year-old left the DW Stadium for French Ligue 1 side Boulogne on loan earlier this month, after falling out of favour under boss Roberto Martinez.
"At a certain time, I believed I would make a name for myself, but maybe I was not hungry enough as when I was in Auxerre.
"I regret a lot some of my choices. If I could do it again, I would take another way. Anyway, I want to show I can be back to my best level at Boulogne."
He added: "I joined Birmingham, where I achieved six good months. Then, I have been labelled as a reveller.
"Last season at Wigan, Steve Bruce warned me: 'You will not play anymore'."
Kapo admits he could have sat on the Wigan bench picking up his healthy wage but preferred instead to reignite his career in his homeland.
"I would have stayed in England to earn a good living. But I am at Boulogne to show I am not dead, I have desire to help the club achieve salvation."