Here’s what helped with my smasnug and the monitors of my friends:

• Settings - Video - Custom - all sliders to middle/“normal” position (adjust brightness from OS)
• If it has HDR and your system supports it, turn it the fuck on with EDID values and never off even when you never have HDR content and when said HDR content looks very SDR (unless screenshots are broken in HDR and you want to screenshot something of course) (and if you have a CD with the monitor with a color profile you better go use that of course lol)