Pay attention to the cables you use too.
An old hdmi 1.0 isn't going to get you 4k@240Hz.
I don't know what specs the steam deck/your display are actually capable of, so no specific recommendations.
I like cables from 'Cables Matter' on Amazon. Nothing I've gotten from them has felt cheap or failed to live up to whatever its specs are.
Sorry mate, your post was fine. I just felt compeled to call out the silly high heels for her otherwise badass combat outfit.
(Considering Mrs Smith had heels in the original poster, its a very good recreation.)