Be contrarian if you can
"Buy when most people — including experts — are pessimistic, and sell when they are actively optimistic." — Benjamin Graham
The secret to investing is to buy low and sell high. You can't do that if you only buy when the market is firing on all cylinders and sell when it tanks.
"If you're able to capitalize on emotion and buy stocks when they are low and have true intrinsic value that is not recognized by the market, you will be able to outperform any benchmark any time," Marks says.