The best settings depends on individual taste. Some likes the images more bright and more color vibrant some likes moderate brightness and less color vibrant .
I have Samsung TV, I mostly adjust brightness -60% , backlight:50%, sharpness:60%, color vibrant: 65% settings ..etc.
I set "Dynamic Contrast" to low which increases the black levels.
I set White Balance points to 50% which balance the black levels.
Gamma correction to 1 or 2 points, mostly 0. (set to high if you see more black levels, even after adjusting white balance)
I think your tv will have similar settings and u may play around these and get the best picture as per your likings.