This is my current roster I've just defeated the champion boss in act 6 and wanna push for throne breaker any tips?
Just a general one. It isn't easy for anyone to give advise on such a general question as "how to complete Act 6." Each chapter in Act 6 is different, and in fact each path in each map in each chapter is different. Best advice I can give is look for guides on the easy paths through 6.3 - 6.4, and tackle them one at a time. Since you're past 6.1 and past the 6.2 Champion, I don't think you're going to have too much trouble up to the Grandmaster. And that fight just takes practice.
In addition to what others have mentioned, just you each quest as a practice tool. Once you got to a comfortable spot in each quest w/out using items, continue onto boss. Repeat. You'll most likely get frustrated. Remember we all did, but we got there & so will you
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I kid. DNA gave some good advice. If you have a Heimdall, he's great for some boss revives fights, especially CAIW.