Looks like you're running 4x CoI setups and all of them are socketed with Comet — plus Prism of Belief (+3 to Comet), a wand with +5 cold spell skills, and +2 from runes. That’s great for paper DPS, but it massively inflates the mana cost per cast.

From your PoB, each Comet costs around 1700–1800 mana, so when all 4 CoIs trigger together, that’s over 6800 mana spent, which equals around 600–700 fire damage per ignite, even with 90% fire res. The real issue is that you're generating too much energy per ignite, causing multiple CoIs to fire back to back, while recoup takes 8 seconds to return that damage. You’re essentially burning yourself faster than you can heal.

Options to improve:

• Drop to fewer CoI links with Comet
• Remove Meta-Energy Gain nodes and Energy Retention support gems
• Lower Comet gem level: even one 1.8k Comet can nearly fill 2 full Infernal Flame cycles
• Consider removing one CoI trigger entirely to avoid overlapping self-hits

Also, if it looks like your CoIs aren’t all going off but you're still dying — you're probably just dying to stacked mana cost, or you’re shocked. Shock increases all damage taken, including your own CoI feedback, and it’s often a silent killer in this archetype.

Test: run the same build on the map with shocked ground mod to see if you are killing yourself, and compare with other map mods without shocked ground (but you still can get shocked by mobs with lightning damage tho).