I have to say, its not really that shocking in the crypto world to have a big loss, everyone has that time to time, I had %80+ down plenty of times, bear markets are literally just periods where we lose big all together. What you just do is end up trying to earn more money, or at least save more money, and buy it when its that much down. That way, you lower your purchasing price, this action is called "dollar cost averaging" and known as DCA, many people in the world knows this. So if you lose big, unless its some shitcoin, and if its something trusted like btc, you just buy more and wait for it to go back up.