Your a short term investor or in short you are a daily trader in which most of the investors are not capable of due to lack of time or tools.
You do not need much sophisticated tools to monitor the market, you can create a bot to monitor the exchanges for any big movement and take decisions.
And not all of the time you will be lucky as there is also a big possibility that the outcome will be opposite. 1700$ in less than 2 hours is pretty good but it needs a luck and a professional experience in order to make this trade successful.
If you are a day trade or a short term trader why would you sell if the market goes down suddenly, you can wait for the market to recover and then take your positions.