The most effective method is something like high-intensity interval training. You need to stress your CNS to some degree. Low-intensity cardio is going to require a lot of time (like an hour 30 or more). Strength will require several, consistent big lifts and can be hard to work at home.

Buying a kettle bell or stationary bike and doing HIIT can wear you out in <20 minutes.

How many days do you do this per week? for me, everyday would totally wear me out and be unsustainable.

The point is to do is to be worn out. Initially, you start with 3 days a week. As your body adapts its energy levels you increase. I ride 20 miles a day on a bike (10 to work, 10 from).

On weekends I ski moguls for 6+ hours in the winter and hike 12ish miles in the summer.

The only time I feel a lack of energy is when I _stop_ regularly working out. You can be very efficient and get the same effect doing 20 minutes of HIIT. When the weather is marginal or I just don't have time that is what I do.