I can only tell you which sectors I am investing, such as utility companies and energy companies. Yes, oil price is below $50 today. So what? some company stock prices are even lower than the days when the oil price was $30.
The economy will be back and the oil price will be up again. If the oil price stays below $30 per barrel. This fact itself will be bullish to the economy in the long run.
However, please don't forget my disclaimer. Sometimes you will make money when I zig, you zag.