I think this is normal. Not only does the price of Ethereum depend on Bitcoin, but all cryptocurrency prices are dependent on Bitcoin. Bitcoin is the leader of cryptocurrency and is also the representative of cryptocurrency, as long as bitcoin rises all The coins will rise, and all the bitcoins will fall.
A psychological effect may be there, otherwise I cannot see any other reason for which bitcoin is effecting other altcoin. Now people have become mature and they select different good altcoin for their investment to make money from there.