Looking for some advice

Hey guys, can someone please give me some advice as to how I can improve my character in terms of OA/DA or chaos RR.

For RR I have CoF, Eldritch Fire and Mark of Ch’thon. I ain’t really sure if I should switch Badge of Mastery with Mythical Black Star of Deceit.

In terms of damage: execution, chaos strike and doom bolt crit between 90k and 124k with hungering void active, just so you can get a picture

Here’s the link to my build.