The "low-hanging fruit" argument deserves further analysis.
It's a lack of low-hanging apples. There's still plenty of low-hanging lapsi, or low-hanging cupuaçu.
Alternatively, it's a lack of low-hanging fruit that we can harvest by whacking the tree with a stick hoping for it to fall into the basket. There are still plenty of fruit that can easily end up in the basket if we pick them up and give them a quick dust off.
I would go with: "There's a lack of low hanging fruit at the edge of the orchard. You need to head in a bit deeper to find it, but it is still just as low."