One way is to use short positions as many people suggested. Just remember to never use high leverage, it will get you rekt. Another method is to take advantage of the small price fluctuations and trade in short times. Rebalancing your different bags can work too.
Finally, A safe idea if you have long term view, would be to hodl valuable assets even during bear markets without giving a damn about no price action and nobody (although I know people will kill me for saying that).