I think, It depends on how you re trading if you are a long-term trader you tactics should remain the same hold the coin for the long term and wait for the market to get recover and if you have more money then buy more coins when market goes down so it will give you good profit when it again goes up. If you are day trader then you have to decide what you need to do if you think the market will go more down then it's better to get out of that coin and buy it back when it comes more down like this when it will go back up you will get more profit.