Keep it simple
Rather than trying to cram every single idea you’ve had into the area behind your house, think about how you can design your space around the idea of minimalism. Keeping things simple can positively affect your sense of wellbeing, as a cluttered space makes those in it feel anxious.
The best way to begin this is to think about what you use your yard for most. Do you want to organize everything around the pool as the focal point? Are you always having people over for a barbecue, in which case the grill is the destination? Think about your centerpiece and let everything flow from that.