BTC Rally is followed directly by eth. Even if you don't move the price of other altcoin, eth will move. There is a specific price difference between Bitcoin and ETH. If the price of Bitcoin increases more and the price of Eth decreases, then it will be equal between the specified period.
If the price of Ethereum has decreased but Bitcoin has increased, then the price of Ethereum has decreased for only a moment. Going back up in my opinion. but if Bitcoin goes down a lot then everything will return to its old price.
Good thing bitcoin doesn't dump yet, and though ETH has increased $730 today, I think it will not reach $1,000 by the end of the year and the moment bitcoin will start to dump, ETH will have the same fate. The market is still about FUD and FOMO, we are in FOMO now, but correction starts, FUD happen.