For a damage buff you can use Vaal Righteous Fire, ideally with Increased Duration support. You could also try War Banner, it's a bit of weird choice for a spell caster but it does give you adrenaline for a few seconds when you drop it, which is 100% increased damage and 25% cast speed which can be useful for bursting bosses.
Another way to boost damage is to get a Fire exposure debuff going, using either Wave of Conviction, or Scorching Ray with Spell Totem support.
For a bit of defense consider using Orb of Storms or Storm Brand (fast hitting skills) with Blind support. Blind is quite nice to have versus some attack based bosses. You can add other on hit supports like Culling Strike or Power Charge on Crit also, if your build uses power charges. (Edit: I should prob mention Arcane Surge support here if you aren't already using it?)
You should probably consider swapping out Blasphemy Warlords mark for a warlords mark on hit ring if you can afford one. (For a cheaper option there is also this ring: https://pathofexile.gamepedia.com/Mark_of_Submission). WM generally doesn't need levels and you use your mana on an Anger or Zealotry aura instead.
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