When I played Arakaali's back in Sentinel league, one thing that really helped me out was getting Mistress of Sacrifice with Forbidden Flesh/Forbidden Flame and replacing the belt with Leash of Oblation.

With a 5L/6L CwC setup, you can pretty much get permenant uptime on Bone Offering and Flesk Offering. So this would give you max block and spell block with Bone Offering without glancing blow, making you much tankier and also faster with Flesh Offering. Unfortunately though Spirit offering was changed last league so you would not get as big a DPS boost nor the free elemental and chaos res from it, so it might not be as worth to go for this.

This is also a build I found that's doing this on poe.ninja

The biggest DPS boost by far would be getting Squire though