I'm always sceptical when it comes to technical analysis on a bitcoin chart. The reasoning behind this being the fact that our brain thinks in patterns. So often we would believe we've seen a pattern while in reality there was none. That's why I'd prefer fundamental analysis over technical analysis on a cryptocurrency chart. We might see another crash at 8000$, we'll never know for sure. Time will tell.
For me, technical analysis doesn't work on bitcoin price movement because its purely based on speculation. That's why I found a lot of TA in the past failed so I guess there's no TA that can fit how the price movement of bitcoin is. Until we have truly crossed that price we can't never really tell it. With that said, we can't never really tell it or predict the price based on TA alone, maybe we need another form of analysis that will worked in conjunction with it so at least make the a 'good' prediction.
Well I think it depends on your trading style. For me it works pretty well to be honest.
But I'm of a reactive trader and don't make any predictions.
I just let the the chart do whatever it wants to do, read it's history, and then just react in certain situations where it fits my trading set up.