In recent two years SPY formed huge megaphone chart pattern. Right now, price touching upper megaphone pattern line and there are huge selling days signalling market is topping. Macro economics indicators - retail sales, jobless claims showing some weakening clearly, in recent weeks. Stock valuations are skyrocket high. Economy will suffer in months ahead because it will be damaged by global lockdowns and surging virus cases in US and other countries and stimulus bill wil not fully cover these hits.
So i see high probability of huge selloff next year, bigger than 2020 maybe.