Is it healthy to do laser co2 after doing derma roller for 6 months?

Thanks for your question, but without pictures and a more complete history we can't answer it.  Rather than self diagnose and treat, you should let a professional with several options available give you some recommendations.  You have jumped from 1 to 10 on the intensity scale.  There several other non-invasive resurfacing options available.  Best of luck.