I guess you buy bitcoin or altcoin at a high price, so now you lose that value money. If you don't have more money, you don't have to sell the coin, but you need to hold for more because the market will recover soon. So when the market recovers and increases the higher pass of your bought price, your valuable investment will increase and profit. This time, you need more patience because we don't know when the price can increase.

If you have more money, you can buy back Bitcoin at the current price because it is at a low price and good to buy. Or you can wait for a while to see what will happen to bitcoin so you can decide later.