This is a level 70 quest. You should master your job and the game's mechanics by now.
If you insist on playing this game with the minimum effort possible, there's patches every 3 or 4 months, you have plenty of time to try and clear it.

I will too get old, and my reflexes will get bad, but I will never ask for a nerf because challenge with meaning (not stupidly hard) it's what makes a game worth it for me. This fight it's not ridiculously difficult if you know what you're doing.

First they complain Shinryu HM is hard and that they shouldn't lock story content behind PUGs, now they do a solo fight and again it's PLEASE NERF? Why do you even play the game? Just wait till you can pay to clear it.