If you want forgiveness, keep bringing up the "subject" that led you to that situation, and don't simply act as if you were just "bad" because, yes and without reason.

There is a reason, Don't hide it.

Another tip?

Don't think you'll be forgiven if you constantly talk about it as if the others are to blame.

Don't say empty words, and NEVER repeat them.

"I'VE changed, they DON'T KNOW, but I'VE changed"

Apologizing is beneficial, but never speak as if the other person "doesn't know" that you're someone else.

Never say, "I've changed", it's empty, ignorant, shameless... and makes it seem like you're deciding you've changed, you have no reason to decide, it's not you the person who should.

What about you ASK "I've changed?"

Also, don't try to play the victim.

Saying sentimental things like "I'm going to cry" and "life is so hard" is very irritating.

Stay silent, hoping for forgiveness.

Don't be annoying.

Talking about life as if people feel sorry for you? Tsk, you'll be making a fool of yourself.