Difficulty of normal content.

[Enjuden]

I think in average the last 3 expansions were pretty fair in terms of difficulty outside of some outliers like the Mist Dragon, Amauroth, Tower of Zot or Final Day that were on the harder side for dungeons. Orbornne Monastery was obviously overtuned to the point the had to nerf it and the butter dragon in Lighthouse had a lot of HP too ("Your suffering is not yet over!", "no sheet, MF! we being fighting for 3 hour and you are still at 40%").
E5N was the sprout killer, in fact the missery I felt from Valigarmarda reminded me of that fight. P2N I remember with certain disdain too. Obviously O11 with the lardboard/starboard bullshit. As for trials Golbez I found particularly difficult.
But the thing is those are outliers in terms of difficulty, dungeons and trials you do them once and when you have bad luck in roulettes. DT is consistently harder all across the board, there is no escape.

The butter dragon is just looking at the screen. And knowing how magnets work. You even get a warning of sorts on the first time. Valigarmanda should not be difficult for anyone, especially in normal mode, so I'll lead with this instead of flame which was my initial idea.

You've gotten away with coasting by since content has been braindead, but the bigger problem is that Red Mage is probably too difficult for you to even perform on and you either haven't realized it yet, or stubbornly want to make it work without putting in the work. Every time people ask about how things are too hard, I see them playing red mage, machinist (yes it's considered hard even if it boils down to 'press all the things'), monk, ninja and they all play jobs that are way too busy for them. You've had 50 levels to figure out that red mage is probably not the greatest idea to play yet you still do.

Switch to Summoner. Your life will be a lot easier and you might learn something. Just play something slower and less intensive when it comes to resource management.