Nadal is working but so is Djokovic.
Fed is still working too, he's been knocked down and it looks like it won't change. He has a fighting spirit.
If one thing doesn't work he'll try something else, anything that may work. He doesn't give up.
Nadal is where Fed was a few years ago, it seemed that there was no answer, no way back.
Nature will create opportunity in response to true motivation and will.
That's where it has to start with Nadal.