Bear market is bad for those who only hold coins waiting for right time to sell. But ironically, their right time, the time when price of their coins reaches high than their investment price, will never come. Bear market does not affect trading. People involving day to day trading can benefit or suffer loss as much as from bear market.
Its not that complicated to see what is happening and what will happen. Investment is the only thing that makes market rise and fall, so we need to know right time for buying and for selling. When you decide to buy just check if the Market is bearish or not then buy after that, our priority should be selling at right time in that bullish market, and so fallen market gives us chance to buy low price.