You could try:

- Adding a log pile or a pile of leaves for animals to live in

- Adding bird boxes or hedgehog homes

- Make sure there is no litter in the garden

- Put out a container of water for animals that visit your garden to drink 

You can find even more ideas on the Wildlife Trust website

https://www.woodlandtrust.org.uk/blog/2020/06/attract-wildlife-to-your-garden/