You stopped being a bad person when you grew sufficient empathy to feel bad about what you did.
But your debt is not paid.
Consider the bad person you no longer are as though they were a dependent in your charge. Everything they did is, rightly, an embarrassment of who you presently are.
You will continue to be a good person as long as you work to make up for the things that your past self did.
Not out of guilt, though:
Out of gratitude that you're no longer that person.