In the end you "Can't buck the market". People always say that it is different this time, just before they jump off the bridge. It will crash within a year.Overvalued is subjective. Unless potential bankruptcy becomes a factor (see Nikola), stocks don't really have a true value. Sure, relative to historical norms, stocks are much more expensive relative to the economy than they used to be. But why are the old multiples more "real" than the new ones are?
Now that doesn't mean the markets won't crash. If we don't get a stimulus bill, deflationry pressures could bring markets down. Or if inflation becomes a problem sooner than expected, a rate hike could crash everything. But it's also possible the markets get pushed even higher. Nobody knows for sure.