Don't forget, the market can drop 20% a day for awhile. Plenty of smart folks are sitting on the sidelines with cash, but time will tell if this is the trigger for a much larger longer-term 2020 deleveraging.
Markets aren't even where they were pre-Trump election yet, so this 30% haircut from the top isn't even a "correction" from some viewpoints.
I personally wish I was ballsier back in 2008/2009 (Ford for $1, BoA for similar prices, etc), but it'd also be premature to jump into this market if you truly think it's the tip of a recessionary iceberg. Recessions take 3-6 months minimum to spill over into WallSt. If you're not jaw-agape at the prices of some of your favorite companies, it's probably not the bottom just yet.
Further, if you take the pessimistic view (ala Japan Nikkei), you might get stuck holding stock that never recovers. Be patient.