Ethereum is the best-trusted altcoin. Therefore, it will be used for many years. Naturally, you can hold it for long. The cryptocurrency will be gaining. Probably, it will go to the Moon even in 2019.
Hopefully it's true, because now everyone is waiting for ethereum back up. because if the ethereum ride then there will be most likely altcoin will also follow suit.
We hope so, it has been more than a year of market red and I hope to go moon this year, the thing that can make us optimistic with ethereum is the hundreds of active tokens available on various exchanges so that we can make ethereum great again.