If you already have Ethernet at both ends I cannot recommend enough game streaming. With the right setup it is almost identical to having my computer plugged in physically, and I am very sensitive to input latency.

I can get 4K HDR 120Hz running over gigabit Ethernet without visually sacrificing too much on bitrate, but you can squeeze more bitrate at lower fps or 1440p (obviously) if that is your preference. You can also tune these settings per-game with the setup I have which is quite useful.

Hardware wise, I'm using a Steam Deck as the streaming client in a docked setup (ala Nintendo Switch). It seems to handle everything I can throw at it, and it has the bonus of being able to run simpler games without streaming anything.

I have a third-party (UGREEN) dock providing power, USB and gigabit Ethernet, display (though unfortunately no HDMI-CEC to turn the TV on automatically (I worked around this using a janky automation script)). The official dock has HDMI-CEC but costs ~2x as much with less IO. I'll deal with my jank script.

For software, I'm running MoonDeck for game streaming via Sunshine on my gaming PC. The Steam Remote Play streaming is good, but not quite _as_ good, sadly.