Hi, Georgie,
Thats, interesting as you seen to have come up with most of the things that I have been reading about! It seemed to me that there are 4 things that are possible to do which require a very small effort. A compost heap, being a bit untidy (letting grass grow, don't deadhead etc.), no chemicals and a log pile. The neat and tidy lawns are maybe an area where it would be possible to be a bit flexible and have a small area which you let grow a bit longer.
I don't think that letting your grass grow long and having a few nettles is a wilderness. Long grass is a useful habitat for insects, some bees and moths also use these to nest in.
If you create these it also means more food for some of the wildlife further up the chain.
So, I guess it depends on your location, how much space you have available and what you would like to see in your garden.
I guess for a lot of people that is about attracting the more visible things like birds, bee, butterflies.
What about if you were not limited by your garden size? How would go about it? What would be the most important things to start with?
Cheers for now
Gary