You need to see every single action at least ones. So unlock all actions for desperation/sensitivity and make sure to see all of them.
Stuck too. Can increase Sensitivity * OR * Desperation to max, but when trying to fill the non-maxed bar, the maxed bar drops. Also Ruin is stuck at around 90% (percentage numbers on the bars would be a nice thing to add at some point!). I believe I've seen every action at least once.
There's also no way to exit (presumably until all three bars are maxed?) that I can see.
Replying to myself (always the way - post an ask and the problem goes away!). Had to max out Sensitivity to unlock some actions, allowing Desperation to be maxed, which unlocked other actions. Once all unlocked actions had been done at least once, Ruin maxed out and further actions resulted in things progressing.