This thread is a bit of a bug bear of mine. I’ve been into hifi and display technologies for a long time now and I still can’t believe how many people have their displays set incorrectly then complain about the picture!
Here are a few screens to show the potential issues.
Many people are either using game mode, standard or even worse, ‘dynamic’ when the most natural and cinematic image is movie/cinema.
Games are often developed with 2.4 gamma and D65 calibration in mind these days, so the best way to get a good picture is to just use the modes I’ve just mentioned. You don’t have to mess around too much, just change the preset.