The only certain things in this realm are death, inflation and bitcoin bubbles. :D
Bitcoin literally has built in bubbles.
The major ones have halving driven phase switchers with four year radius momentum.
Most charts today don't show pre 2013 era due to famous Mtgox event, but there were actually four bubbles in bitcoin already, we are witnessing the 5th (THE FIFTH) one. :) At the chart bellow you may notice exit points in the previous three bubble formations.
Now, there could be a rapid break up soon and we could see two spikes, just like 2013, when early investor phase is over, or we could just follow one major just like 2017.