If the current price of Eth has a tremendous gap from the level you buy in, then u should just hold it hoping it can climb up again in some days, then if the price gap stays in the range you can bear, then you should sell them all.

ETH staged an extreme tragedy yesterday. After falling below $200, we can say with certainty that ETH is now in an extreme bear market. Earlier we said that the project side sales will continue to put pressure on the price of ETH, but we did not expect the pressure to be so great. From a technical point of view, a break below $200 makes ETH re-enter into a downward channel that accelerates the decline. The break in this psychological barrier may cause further selling pressure in the market. It depends on whether ETH price can hold $140-170. This interval is over.

Here, there is news that the Chicago Board Options Exchange is preparing to implement Ethereum futures, which may also be the bitcoin futures that Fire Bitcoin launched at the end of 2017 to try to save the market in Ethereum. Because the launch of Bitcoin futures ignited the Bitcoin bullish market, it also led to the rise in the price of the entire cryptocurrency market. However, the ETH's problem is not that simple. The congestion problem of ETH has seriously affected the user experience and cannot meet the huge demand for user volume. If ETH does not solve this problem, it is likely to be replaced by other Eth-based blockchain technologies such as EOS in the near future. A well-known blockchain expert believes that the value of ETH will return to zero in the future.

As of current, any market control tactic can not save eth's life, only the tech improvement can. Honestly speaking, Eth has done a excellent job before, obtaining such a large community of Dapp participants. We all wouldn't hope Eth collapse one day.