You just suck up the losses that you have made and you move on. Losses are just as much a part of being a crypto investor just like profits are. Just hold whatever coins that you have and as long as you do not sell the coins that you have now in the bear market then you still have every chance to make back all of your money and coins when the next bull but you might have to wait for a while.
After making losses, you don't just "suck up the losses". You will have to analyze your mistakes. See what went wrong and what you could have done to prevent your losses. And always holding the coins is not the best thing to do. A shit coin will keep on dropping no matter how long you hold it. Better to let go someone your investment to reduce risks and open opportunity to invest on other coins which have better potential than the coin you are currently holding.