Right now it seems that all alt coins' performance is tied to Bitcoin performance.
this has already been explained many times, but I'll add just the following, the altcoins need to evolve a lot so that they are independent of bitcoin. Altcoins must partner with many real-life companies, altcoins need to be useful in real life only so they will be independent of bitcoin. In the specific case of ETH my advice is the same.
Do you think that someday ETH price movement can be separate from Bitcoin's?
Of course one day the altcoins will be independent of bitcoin, but this will happen only if the altcoins are to have much use in the real world.