Upside: SPX ran into upside resistance at 2102, so the move higher has been delayed.
Downside: There is a strong technical support around 2040 which aligns with 50 day moving average, Fibs retracement 68% and Bollinger Lower Band.

200 SMA – 2010
100 SMA – 1999

My Charts:
Fibs: https://www.tradingview.com/x/YnZW9JGp/
MA : https://www.tradingview.com/x/0EFppX7R/