n bear market I think experienced traders or money makers are the only one that is capable of getting profit from it. We should plan our trade strategy maybe the great strategy is wait for the bottom in the bear market and if you think that is the bottom we should invest our money to the coins that we think will give more profit for us. And for bull market all you need to do is hodl and get profit when you are satisfied 
I think, to manage the risk of investing in the crypto currency is you have to know when the right time to buy and start investing and controlling your emotions, and being patient is the most important thing