What if 2013 Bitcoin crash repeats again?

Noob here. Drawing some random stuff based on 2013 collapse after Mt Gox. 2013 crash and stabilization took about 660 days and -80% retracement. If a similar scenario happens, we should be seeing BTC drops to 3.8k and stabilize around October 2019. I don't belive this would happen. We don't have any catastrophic event happened, instead we hear positive news lately. It is just a thought, don't mind me.