You can go through the slides in these presentations and see if there is anything that you can do that you are not already doing:
Reduce Electrical Use - Part 1
Reduce Electrical Use - Part 2
I give public talks on saving energy. My electric bill averaged less than $20/month before I added photovoltaic solar power to my house (now it is zero most months).
These presentations were intended for the general public and talk about things most people would find acceptable. They don't include more off-the-wall things like bubble wrap on the windows (which is a good technique) because most people, particularly women, wouldn't find them acceptable and may not be code compliant. Code compliance is important in my case since I give many of these talks at local government events. These talks were also focused on Florida, where I live.
There are also more articles on saving electricity, solar power, and other topics you may be interested in within the "Rants and Raves" section of this website.