about 3 months, there has been a lot of fluctuation causing the price of ETH to drop dramatically. At this time Should hold ETH ? Can ETH price increase again 1k3$ again in late 2018 ? 
That is possible. But it takes a long time. The end of 2018 will not be able to solve the problem. Everything that grows long takes time. If you look forward to strong pumping, you will not be able to earn money in the long run. Because if the market pumping happens a lot, it shows that the manipulation is getting stronger and the real value of the altcoins is no!