BTC is doing its second megawave now.
First wave lasted from 2009 to 2013 with 3 bull markets and 3 bear markets. With 2 major bears and 1 minor bear.
The second wave started from 2015 and is now in progression. We just completed the first bull wave in it and right now in the bear trend.
Two more major bulls and 1 more short bear to come.