General philosophy: Buy ETF that is (1) below at least 52-week lows and below Dec 2018 price point (2) too big to fail (i.e. large market caps), preferably with investments from big wall street+political influencers (3) diversified, and (4) you have reasonable assurance of rebound in 1 year time frame.
With this, I think good buys are XLE, SPY, VFH, VNQ.