This is not new with every altcoin. They tend to dump their coins to bring it back to bitcoin.
What can we do with this?
We just have to wait when they buy back altcoin and I know they will.
This is a part of trading which those who have just a small amount of it are affected.
Those who have the larger amount are the one who controls it.
But I am sure it will be back. Patience is the key.