Never spend or sell all your bitcoin never again , though there is a need to cash out yet always maintain some funds inside because we never know what will happen next day.
bitcoin is simply amazing interms of volatility and also the capacity to change the market over time is there.

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Hope that this will serve as example for all people engaging in Bitcoin that by any chances , invest in bitcoin even with small amount because once this reach a million value , everyone will feel the bitterness like what OP had now.