Using the Magic Linear Regression Channel [MW] on TradingView.com we look at some possible scenarios for SPY price movement. A shorter term regression channel shows SPY at the top of the channel and rejecting it today - even with more buyers than sellers in the TradingView Volume Footprint chart view.
The bottom of the channel converges with last pivot low near $584. It could conceivable go lower, but with lower volume likely during the holiday season, it would seem less likely for it to make any more big moves barring some major unexpected event.