The market is gradually coming back just the normal way it behaves. As for selling when it gets to $700, that's a good decision because it will give wide gap and you can use that to acquire more coin when the price goes down again

It depends on how promising the coin is and also it depends on how you get the coin. If the coin is a promising one, you can wait for long but if not, sell as soon as you see that you can make profit. If you get the coin from bounty campaign, you can easily sell when you make reasonable money from it but if you buy it, you will have to wait till it goes up than the amount you buy

I don't see anything threatening the survival of cryptocurrency. That prices are down doesn't mean that cryptocurrency will die. It is just the normal way which the market behaves. As it is going down in price, it will surely go up again

Since we don't know and can't predict the auction that is going to perform well in the market, it is better to have lots of them so that you won't loose out when any of it starts performing well in the market

I am certain that ETH will bounce back because it has happened before and from all indications, this won't be the last time such will be happening. It is just the behaviour of the market