Tunic is a blast on steam deck, I highly recommend it. I've also been playing Vampire Survivors, Dishonored, emulated Nintendo games: Breath of the Wild (wii U), Super Mario Bros (switch) , Advance wars (ds). Basically anything that can be played with a controller works well, and some of what needs a mouse and keyboard is also good.
Quora was great for a while and then one day I suddenly realised how much garbage was being pushed down my throat... Or at least that's how I remember it, I never looked back after leaving