You are using BLM, correct?
Have you considered trying to power level up a class with a lower skill floor? Swapping to an "easier" job would help.
I'd recommend:
-- WAR (it has fewer actions per minute, like BLM, and power levelling a tank will give you good que times).
-- If you wanna stick with a Caster (I wouldn't blame you, your glamour is very nice) I find both RDM and SMN are both much easier on the execution and don't ask as much of you when the boss starts throwing everything at you.
What's your iLVL?
It looks like you're using level 86 gear of about iLVL 539, correct?
Your BLM is 89. I don't know what the iLVL synch is on that duty. Could you try buying better gear from some NPC?
It looks like there is a vendor selling level 88 gear here:
https://i.postimg.cc/Y2zbMPCS/Screen...732-Chrome.jpg
Also, your current materia is nice, but it's almost all Spell Speed. It sounds like your main problem is dealing enough damage in time, so if you're up for it you could also swap in some more Crit materia.
After you fail the solo duty... twice(?) it gives you the option to tone the difficulty down. What is the furthest you've gotten on the lower difficulties? I'm having a little trouble understanding how far you've progged from your description.
Also, have you looked up how BLM "works" in Endwalker?
I don't doubt your skills or capability to play it, I just know I can
think I'm doing something right, when actually I misunderstood something and it's holding me back.
You're stuck
for now, but we can help you through this~