Straight answers to your questions, You have mentioned that he got exparte divorce, but how, you have not mentioned. You have not clearly mentioned that how other cases are closed. With your consent or without consent !
Generally, You cannot file Contempt of Court after laps of 2 years. And there is no reason mentioned in your quire
You can not reopen your DV cases. Once cases are closed with compromise terms, it cannot be challenged.
If he got exparte divorce (it should be mentioned in the Order/Judgment), you can reopen and contents the case.
You said that he got remarried. If divorce case filed by your husband is dismissed on merits (finally, if you contest). Second marriage is illegal.
It is better to discuss with your Advocate. He will find solution.