We bought one of those gizmos which tell us what each of our applicance uses.
Our old chest freezer was the biggest culprit in usage. It is on for 20 hours out of each 24. Dreadful. It has a dodgy lid.
2nd biggest culprit - we have a 2kw heater in the "airing cupboard". Dawned on us that I only need it on max 3 days out of 7.
Will be hanging up washing outdoors more, like others.
Oh, and DH and I have two computers on, day and night. Need to tackle that too. But to be fair, we are both on them for several hours each day.
Trouble is with electricity, it is pennies spent here, and pennies spent there. Which all add up over the space of a year.
You could try, like I have read others have done, literally turn off all electricity all over the house. And you may soon see what is very important, and what is not so important. Or you can find ways around. A bit.
Good luck.