Here you can see both bullish and bearish lines, one from the start of bull market and other from the start of bearish movement. In my opinion this exact point could be the last dip for ETH (I hope) but everything related to other market factors which could effect ETH beyond our calculation.
But right now there 3 strong wall of bulls waiting in 3100, 3000 and 2800 which I think the biggest one (3000) could stop the drop...
Anyway, even if there are deeper dips, dont forget to buy from these points as price will increase after each of them and drop after that.
Always use stoploss and always study and decide on your trades by yourself.
These informations just my opinion and could be wrong too.