Just like Bitcoin, Ethereum had it fair share of booms and busts in the past, even though its much newer.

It had a very succesful launch back in Summer of 2015 but at the end of the year, it broke $1/per ETH.

Then in the Summer of 2016, it reached a high of $15 or so and then due to the DAO hack it kept crashing down to like $7 or so.

Same thing in Summer of 2017, it peaked at $400 and went almost to $100 right before hitting the $1400 ATH in 2018.

If you believe in the technology then just hold your coins, don't buy more or overinvest if you don't think you can deal with the financial losses however.