Oltopetish
If mining an explored field completes successfully, we recover some amount of focus.
I'd like to see this mechanic extended to already known nodes (like amber at the entrance to the capital, or herbs for the florist).
I think this is already in the game. I am pretty sure you can achieve this by doing one of the Tryker rites. But the rite also increases your node time which may not be favorable for a high level forager.