An example of this is when I bought eth at 475 and sold at 1380. Right after I sold I bought ltc at 230 thinking that it was gonna skyrocket after some of the money from the eth will flow back into the other coins.
unfortunately now Bitcoin and Altcoins one way, when Bitcoin go up, then Altcoins up and Bitcoin down then Altcoins also come down drastically.
maybe you can be more patient to buy more Ethereum at $ 400, because market cryptocurrency nobody knows when it will go down.
I always see the starting point of rising Altcoins price to buy back.