Most of the time, the best way to cut down on something is to analyze it, whether that be spending or energy usage. So, it might be worthwhile to analyze the energy usage of your home in order to get a better picture of what you're actually paying for and where all your money is going. Doing so can help you figure out if you're paying more for heating and cooling or for things like appliances.
After you figure that out, you can begin tackling your energy usage in a more specific manner, but it may require that you invest in some smart infrastructure for your home, such as a new thermostat.