@praisebelial I thought alternating between Arcane Blast and melee auto attacks would be good, too, but when I tried it in-game, it wasn't very effective at all.
Your melee attacks are interrupted whenever you cast Arcane Blast, meaning you effectively reduce the chance to proc the delirium and Arcane Blast can quickly start eating up your mana before it does, meaning you're also reducing the maximum duration of the delirium as well.
The starting rotation I found best was:
Sunfire (with RE) your main target to boost spell critical against it -> Moonfire to apply the dot -> Arcane Missiles to spread Moonfire, then Charge to get in melee range and generate some rage. Now that you're in melee range, start spamming Deconstruct and Arcane Barrage on cooldown while keeping an eye on your other procs (refresh Moonfire if Missile Barrage procs and then immediately use Arcane Missiles to spread Moonfire again; cast Arcane Explosion when Lunar Spirits procs from Moonfire ticks) Once the delirium procs, you could try spamming Arcane Blast over and over on single targets, but I usually stuck with alternating Arcane Barrage / Deconstruction on single targets and Arcane Explosion on groups while it lasted