of course sell it, if you play the trading and intend to keep it for a long time, you might lose, it was I proved myself, but it's up to you bro 
It won't be profitable to sell it with current price, price is not the best at a moment, its better that we hold it for next few months, and sell it after the halving when the value of bitcoin is in better position.
Yeah, I think we should buy bitcoin at this price and save it for few months, and sell it after the halving, I am not sure about the mining part, so for buying, saving and selling will be more profitable.
And that is not good. Just have patience and see for what is going to happen. We all hope that the value will rise for a long time.