Hold on to your Eth AND try to invest in other coins which have potential. Not too excited about Eth's future, actually. One obvious Ethereum weakness that can eventually weaken its claim on the "top spot" is that it lacks any way for developers to get their apps in front of end users, which is what they ultimately need. One coin, Byteball, is like Ethereum but it has an end user friendly interface and smart contracts anyone can read. Even a kid, honestly.
The bull market will come again but I think Eth won't get the lion's share of profits