I don't have the full storage space because my house isn't fully expanded, I really wish they would give us the storage expansion without it affecting the size of our homes though. What I do to save space is get rid of all things that can be reordered and I put some of my crafting materials outside like decorations like having stacks of shells on the beach or stacks of rocks by my rock garden. Most of my items in storage are clothes, I usually have 10-20 open slots if I'm being good about it.
