DO's price action on the weekly has begun to flatten out, BUT not stop going down. A descending has formed suggesting a setup is possible. There are still two important higher highs: $26.49 on 07/11/2016 and $20.41 on 01/08/2018 that must be taken out first. If those two can be taken out it would suggest the was a bottom. Notice that the indicators also look good. heading up. setting up for an up move. OBV also looks good
DO's price has returned to it's long term base after years of price declines. Recently price has flattened out. This is important, it means price momentum can begin to turn in the other direction (or it means the company has become a zombie stock, but i do not think that is the case with this one). Looking at the indicators, notice has already sprung up. OBV has flattened out after years off declines and the is leading up.
So how to play this? My suggestion is to see this stock less as a trade and more as an investment. Use the red line as your trigger to exit and the blue line as your trigger to buy. I would either buy the stock outright and hold it or use options. The Jan 2020 call strike $17.5 bid ask: 4.25 4.80 looks promising. You could probably exit the option sometime in 2019.
All that being said, I am not stock guru or certified financial anything. Do what you will with the idea.