We tend to think of a mistake as something we did wrong, but when it comes to investing, the opposite is often true. The biggest mistake I see investors make is not what they do wrong but what they don’t do at all. A lot of people are afraid to buy into strength because they think they’ll buy at the top, but those same people are also afraid to buy into weakness because they are afraid stocks will fall further. The result? They’re not in the game, frozen in a holding pattern as they wait for the “right time” while the market and many stocks continue to hit new all-time highs.