There is no exact prediction about how the next ethereum price is, would it be better if you buy ethereum with half your money and then half you set aside for another altcoin, so you are safer if Harag ethereum decreases
but I will confidently tell you that it will grow very strong at the end of 2019 and early 2020. because they are going to upgrade the system to a new level, ETH 2.0
It is creating great attention and if they succeed in the new public platform, I can assure you that its price will increase by more than 50% from now.