Let's do the opposite of what public believe

It seems that everybody is shorting DOW, NAS, and S&P500. So far, I've successfully opened a few long positions, and closed it all, as the main reason was the public or almost 80% of people who opened short position according to an investment sentiment. Also, the chart and a fundamental doesn't say that it will go down. Now if we see the investment sentiment again, 78% of people opened a short position. So, I've opened a long position again, as I am believing that the price is now in a range.