The only way to kbow you make a reasonable patient is when you wait till the market bullish is back and you are not selling at lost price but selling off quick to invest elsewhere is a habit of impatient and the 90% of traders with no sufficient portfolio management knowledge that make such decision are among the traders that later quit.
Meanwhile, it better to invest elsewhere using a new capital while you keep previous invest till it green again.
That's not the best decision either I think. It's like you invested @ $100, then it turns to $90, you want to keep waiting, then it turns to $80 - you wait, $70, $60, ... and @ $50 (for example) your position gets liquidated for instance. But you could sell @ $90 and keep the cash or invest elsewhere. Plus, there's time value of money here too.
As I mentioned somewhere here earlier a joke that
"every bad trade ends up being a long-term investment".
There is time value of money but if the coin is a well supported coin with good concept and utility there is no need to sell @$90 or $50. The best thing to do in this knd of the situation is to leave the investment and start a new one at the $50 price if have enough capital but if capital is an issue is better to sell @$90.