Batch cooking basic things (eg beans) and freezing then helps you save energy rather than cooking bit by bit
Use a thermos for tea rather than putting the kettle on every time, and only boil enough water that you need not the entire kettle
Don’t take two showers a day
Make your own jam, yoghurt, tomato puree etc. this saves tonnes of money too
Bake bread, cakes, biscuits at home
Use your freezer a lot more. Freeze vegetables, leftovers, etc
Don’t buy ready made food (pret etc)
Put plastic over your windows to save heating costs, esp if you live in an old house
Walk more
Use a bidet if you can
Invest in good thermals, fleece, etc and turn the hearing down. Insulate your house
Wear glasses more rather than contacts if possible