US stocks have rebounded dramatically from the coronavirus sell-off in March 2020.Xinhua News Agency/Getty Images BMO Capital Markets' Brian Belski has the most bullish S&P 500 forecast on the street. The veteran strategist thinks it will hit 5,300 by the end of next year, from around 4,600 on Friday. Belski told Insider why and dismissed market bears such "The Big Short" investor Michael Burry. Brian Belski, BMO Capital Markets' top investment strategist, went on CNBC in March 2020 and predicted there would be an "epic move to the upside" in US stocks, like "something we've never seen before."He was right then, and now he's back with Wall Street's most bullish forecast for US stocks, predicting earlier this month that the S&P 500 can rally more than 13% to 5,300 by the end of 2022.At the root of Belski's bullishness is his belief that company earnings will stay strong, central banks will remain supportive, and that inflation and supply chain problems should cool."I believe that next year is going to be another good year because I think people are too focused on inflation.