I know ETH has fallen hard recently, but its movements are still tied closely to the market as a whole. Looking at the whole crypto price movements this year, we can see that we've bounced back a bit from the $190 billion low (for the second time). However we haven't bounced back particularly strongly, so the question is will we continue to fall? ETH price has moved up in the last couple of days, but this is insignificant against the longer term pattern. It's difficult to tell if there will be resistance if we drop back to $190b again. However the fundamental promise of crypto remains undimmed, so I think the long term price will be much higher.
So personally I would say in this sort of market you can either short your ETH when it's dropping, or if youre average purchase price is higher than the current price you can buy more to DCA.