I ended up getting a second LG 31MU97-B while I waited for the first one to get repaired (about 2 1/2 years ago). Then that replacement monitor had to be repaired for the same fault as the first one (internal power-board replaced). There's been a third fault since then, that luckily hasn't required repairing. It's made me wary of buying any further LG monitors altogether.
Apart from the reliability issues, I think the LG 31MU97-B's are still perfectly useable for non-critical work (they were never high-end anyway), but I'd definitely be looking for alternatives if I had to get a new monitor today (can't even find new 31MU97's here anyway now that I've looked).
I haven't been following closely the latest monitor releases, but the LG 27UL850-W does look like the closest thing to what the LG 31MU97-B's once were, just cheaper, smaller (27"/31") and 3840 x 2160 instead of 4096x2160.
Looking at the 32" BenQ PD3200U and checking out it's manual, that's what I'd be choosing if I had to pick between it and the LG 27UL850-W.
There's also a 27" BenQ PD2700U to consider.
There are also some Asus Proart 4K monitors that are a bit more (and a lot more) expensive, not sure about the value there.
I'm guessing you already know, but for anyone else who doesn't, whichever monitor you get, first get an X-Rite i1/Display Pro ( https://www.xrite.com/categories/cal.../i1display-pro ) and download DisplayCal ( https://displaycal.net/ ), if you haven't already.
A big reason to get these monitors over some of the others is that their colours can be adjusted with those calibration tools.