The rise and fall of bitcoin is usually just the correction stage but I believe that bitcoin will be heading for $15k very soon, which means Ethereum too will shoot higher that the value you have seen for this year, and it will not also be long before Ethereum and other altcoins starts their own bull run when the altcoins  season starts, so delay is quite dangerous, where Ethereum will be in the bull run in unimaginable, so it is better to just buy now even if the price declines a little bit later.