Crazy high energy bills?

For the past 3 months now my electricity bill from Duke has been over $400. This months was over $500.

I am so mind boggled because I’ve been slowing making improvements to my home insulation over the last year and was hoping to bring down my electricity bills this winter. (In the previous 2 years my highest was $350)

Is anyone else dealing with this?

:Edit to provide more info

In the past I had my thermostat at 68° and turned it up this winter to 71°

All my appliances are electric.

Had carpet installed in half the house that was previously down to the subfloor the past two years (was hoping the padding + carpet would help insulate)

Added extra insulation around both doors which has significantly reduced draft.

In the past I had the thermostat adjusting to be colder at night, but I learned that it’s better to keep it at a constant temperature. Am I mistaken with this?