This is just my personal settings I’ve found that work well for playing on a TV, but I usually cap my fps at 30, limit my external display resolution to 1920x1080 (you can set this for all games in SteamOS settings) and enable FSR. Goal is to still run the games at 1280x720, but use the FSR to upscale to 1920x1080.

I cap the external resolution because there is a noticable performance hit when using FSR or similar tech to upscale to 4k.