Wanting to talk about NC from years ago

I went NC with parents in the past, long story short we started talking again a few years ago. Prior to NC I had tried to explain my side (In hindsight I know that wasn't the best, but I didn't understand back then). Since then, parents continue to bring up how I traumatized them and gave them the worst experience of their life by going NC and demand an explanation. Thing is, I've already given them one and I don't see this conversation going well if we were to have it. I'm not sure if I want to go NC again due to the stress of it the first time. Any recommendations on how to redirect this?