Monetary polices. It's all about monetary policies.
Dot com crash. Housing crash. Coronavirus crash. 1929 crash.
All of those rebounded as a direct result of being resuscitated back to life with an infusion of cash.
George Soros said it best....humanity, the markets, goes through cycles of Euphoria and Crashes. Happiness, and sadness. Gyrate those two like a never ending roller coaster. The market will always rise, though, just like the world's population.
Ignore everyone on TV, or on websites. They get paid to fill ad revenue content filler. They could care less where the market goes, or how accurate they are.
They all pull up past hindsight charts...talking about it like such prophetic experts.