No, ofcourse not. If you are long term holder then you should not be worry with this condition. This is only part of cryptocurrency market volatility, if you have plan to hold bitcoin for 2 or 3 next year then you need to be more relax. If you want to convert tour btc into fiat in the near time then you should convert it now. I thought that the bear market will not forever, maybe next year the price of bitcoin will start to rise again, I guess the price can reach $100.000 when the bull market take it's turn.