Download Decky in desktop mode, install VibrantDeck plugin, and increase saturation to around 135 to make the screen pop a little more.
I recommend Devil May Cry V and Metal Gear Solid V The Phantom Pain for AAA games that look and play great with little to no tinkering.
Or you can tinker to your hearts content, it's what's great about the deck!
Same, I've been dabbling in these handhelds for about a year or so now and I always tend to go right back to the Vita, it's such a solid device.