I'm familiar with your story. And. Well. I was really happy when you finally filed for divorce. He has been utterly unremorseful, continued to lie and cheat for many years after your dday.
Very few waywards actually want divorces. They want to have you and their piece on the side. If you feel you need to try again, I would set the bar for his actions as high as possible. He has to make massive changes in his behavior and thought processes. All the work should be coming from his side. I would make sure he is in IC and I would be very, very careful in MC. Best of luck to you.