Hi @andy1pom
I too have considered going "off grid" but so far have not done that, as the hassles and expense of a back up generator is not viable.
Your data when you are away is handy as a baseline for your quiescent load. It also sounds like you have made some effort to reduce your usage already.
The items which are the highest loads are items that heat of cool, especially for long periods. This includes Hot Water, Air Con, Fridges and Freezers (The last three work as heat pumps but still present a big load) Spending a bit more to have an efficient model fridge/freezer can save you money over the life of the product.
The other way to save some money is to shift your usage from the Peak/Shoulder times into the Off Peak hours. This is typically from 10pm to 7am on weekdays and all weekend. This is possible with timers and using items that have a high draw at those times, which can also be a PITA. The other way to do it is by installing a battery. If you cannot afford enough capacity to be almost self sufficient, at least get one which will supply your house from the afternoon until after 10pm. This should mean you will mainly be buying power at Off Peak times. Then you should also shop around for a plan which will suit you best.
Another small thing is that you can buy Solar Fish Pumps, assuming it is an outdoor pond.
Good luck.
If you do look at a battery system also shop around, as they do take a while to pay back the investment. A lot of the Lithium Ion units are only guaranteed for 8-10 years and projected lifespan of 12 - 15 years. i went for one that has a 20 year warranty and a projected life of 50+ years.