I hope you find this useful. I have graphed the last two peaks of bitcoin.
Both lines start at the very top left, I've used the opening prices from bitcoin.com.
The first peak from 1st December 2013 was $1128.95 (Red line and right hand axis for values)
The second peak from 17th December 2017 was $19475.8 (Green line and left hand axis for values)
The graph shows that it took 411 days from the 2013 high to reach the last low before the price finally recovered.
What I take from this graph is that all things being equal we can expect the price to carry on declining for another year and maybe bottom out at $3k.