But we can try the other way - collecting more and more. I think you only get loss if you sell it and go away. Instead of that, stop-loss at 10 - 20%, then buyback more when the coin drops to a lower price.
An example: You accidentally bought 10 BCC at 1100 USDT (11000 USDT total). 1 month later, the price of BCC drop to 1000, so you cut loss all your BCC to get back 10000 USDT. The price of BCC is 880 for now, you buy it back and get 11,36 BCC. So when the price gets back to 1000, you will get some profit (360$).
Btw, this way is hard, very hard. Because you have to know or predict when is the end of the bear market. So if you don't know clearly about the moving of crypto-world, just hold!