Your decision to buy ETH coins when it reaches $ 80 by the end of 2018 is a very good decision. And with the purchases that you have for now, of course, you will make a lot of profits. Ethereum is now almost $ 200 but if you want to be patient and last a long time. I am sure if Ethereum will reach $ 400.
We don't know yet how high ETH can go now, the rise is really nice and if you do have the chance investing when it's dipping you are already in a good profitable position. you can sell now you capital and keep your profits while waiting for more higher value or if you can handle the risk you can wait all
in to collect bigger earnings.