Fundamental Analysis
Oh wait there are no fundamentals to justify the amount bitcoin has increased, just a bunch of people buying hoping bitcoin will go to a million so they can buy a Lamborghini.
Technical Analysis
Broke trend is a potential sell signal. Bearish Engulfing Candle confirms trend break sell signal. Additional downside confirmation of bearish engulfing candle. RSI overbought at levels of December 2017. Looks like a solid topping pattern, similar to December 2017. Confirmation is when we break solidly below 10500. It finished the 5 Elliott waves cycle.
I don't believe it will crash as fast as it went up, I believe it will be similar to the previous crash from 19k to 3k. The people who make money on this got in early enough to the pump and sell.