I am at level 200 with 223 cap on habitats but game won't let me expand even though I only have 152 habitats. Message says "You've already expanded everywhere in your forest that is safe to explore" - what does that mean??

So maybe if I delete the huge amount of stuff in storage I should be able to expand?
I really don't know if that will fix may expansion problem. anyone with suggestions??

I have an Ipad pRO-IOS 12.2