For now selling is not a good decision, but if ethereum increases $ 700 then selling can be done to overcome losses, but if you want a better profit then hold it for a better improvement.
Yeah that's a good suggestion, selling right away is not good option as the price is still at lower compared on the normal price. Holding will give you relief not to sell at a losing price and have patience to wait for the price bounce back of ETH as this can recover in the coming months. Just trust this currency as this has the capability to make a pump.