Why only consider the SUPPORT 1 = $ 64xx, there are support line before it?
The Fibo certainly works differently to the forex platform fibo so I'm not sure how the trading fibo tool to be accurate at pointing out which supports are stronger. But to me $73xx and $69xx are considered to be support already as we break it. That means the battle again will continue when prices dips that level.
In case price dips at that certain level, that's also a bigger opportunities for investors who still planned to venture with bitcoin. Tools like fibo always have the capability to do the basic trading as well, first of all as you take control of that decisions made; our personal principles will be the first priority. When we seek for other options, just take the opportunity of your alternative resources which you can use at any random state.