Total market fund has underperformed S&P 500 over the past 5 years.

When I began investing 10 years ago, many recommended a total market fund (e.g., VTI). But I see that VOO has outperformed VTI by at least 10% over the past 5 years.

Am I fool for being deep into VTI or is the underperformance in small caps bound to end eventually?