If you don't feel able to anything suggested so far, or you do all these things already, don't worry there will be more suggestions over the next month, and hopefully many more months to come.
1) Buy less. This will almost certainly save you money and reduce the clutter in your home, not to mention reducing the amount you waste. It will also mean you are using less of the world's precious resources unnecessarily, so there will be more to go round for everyone else.
5) Waste less. It will save you money and the planet will be happier for it.