I think if you want a garden that attracts wildlife the one main thing you can do is introduce water bird baths are a definite winner . Not only do they attract all sorts of birds but I regularly see bees land just on the edge having a little drink .
If you’ve got space a pond is excellent you’ll be amazed how quickly your pond will thrive . Mine is full of life , frogs tadpoles ,snails ,leeches and all other water insects . I now regularly see dragon flies and damsel flies in the garden . It doesn’t even need to be a big pond . This is my second pond it’s only the size of an average washin up bowl , and it’s full of life .