Help me get cavalier

With cavalier difficulty coming up next month I decided to make cavalier push after I rank 5 doom and also I have good stash of revives 30 20% ones and 10 40% ones so what to do u think what bosses poses a threat for me and how to tackle them 

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https://youtube.com/watch?v=g_-nTlhXwzw
The hardest boss would probably be crossbones with omega red being the best champ for it colossus can be okay for it but will be long because of the vigor.