Interesting, I have the same issue and never thought to change monitor. I think mine is already IPS, but how do you know the quality from the specs? What actually matters for eye fatigue?
3440x1440 (UWQHD) ~4.95MP 134.38%
3840x1600 ("UWQHD+") ~6.14MP 166.67%
3840x2160 (4K UHD) ~8.29MP 225%
You either get more screens, an ultrawide, or a 4K screen and try software scaling lower.
Which is?
If I had the budget and always worked on a Mac I might spring for an Apple Studio but it would have to have the nano-texture glass.