A leverage point is a place where a change could have a substantial effect on a system. Donella Meadows proposed a list of twelve places to consider, from numerical settings to goals and underlying assumptions.
Her essay also warns against treating the list as a recipe. It is a framework for widening the options, not a measured ranking that tells you which intervention will work best in a new situation.
For your household trial, compare feasible changes against evidence, authority, effort and side effects. A small practical adjustment can be the right choice.