For me, Hodling is still the best thing to do.
Technically the bottom bottom is 0. It cant be negative. Though I had a very disturbing dream where I woke up and Bitcoin was worth $0.30. It was like I was the last person HODLing and I could cash out for like $3. Very disturbing dream. Then, I woke up and I realized I still lost a boat load of money from Bitcoin being at $7000 but at least its not $0.30.