I think if we have seen the good things that Ethereum did to the crypto world as it is now. Many Ico launches their blockchain bearing from smart contracts Ethereum. Ethereum is a very useful crypto coin today. It's better to hold this coin for a longer period of time. Because it will give you a big advantage. So ETH is very worth using for long-term investing.
Indeedly, Ethereum is really worth to hold for long term investment ,it is one of an enourmous asset that has a viable flatform and it is very promising prospectively on which many investors resembling to invest in this asset. Holding it for long time can give accumulate profits and gain great privileges when the bull market occur.