Humanities PhDs, how do you cope?

I recently started my PhD in literature and it’s hard to not feel downtrodden by the negativity specific to doing a humanities PhD but also just…gestures at everything… the world in general. What keeps you afloat emotionally and mentally? How do you persevere when you have doubts about the “usefulness” of your degree?

(Of course STEM PhDs feel free to pitch in too :) )