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 ? 
Ethereum is not having any huge problem at all, so if the price is falling, that is not a problem also. You only need to keep your patience and your Ethereum, too. It only needs weeks before this top coin will get back to $1,000.