Jaylen Brown has made the Boston Celtics an NBA powerhouse. He helped the Cs to six Eastern Conference finals appearances in his first nine seasons. Brown won the NBA Finals MVP when the Celtics captured the championship in 2024.However, the journey has not been easy for the guard drafted No. 3 by Boston in 2016. When they lost to the Miami Heat in the 2023 Eastern Conference finals, Brown shared his emotions on his Twitch channel on Thursday:“We hadn’t won a championship. It killed me. I wanted to win more than anything. …. It humbled me. It made me more focused, and my mentality shifted crazy going into that next year."The 2023 Eastern Conference finals were another meeting between the Miami Heat and the Boston Celtics. Boston, the second-seeded team, took on the Heat, who earned the right to face the Celtics after surviving the play-in tournament.The Heat had already taken out the top-seeded Milwaukee Bucks in the first round before dispatching the No. 4-ranked New York Knicks. Still, Jaylen Brown and the Celtics were the definite favorites entering the showdown with Jimmy Butler and Co.Boston went down 0-3 before winning the next three to set up the thrilling Game 7, which the Celtics lost 103-84. Brown recalled how even the home fans wanted him out.Jaylen Brown found his vindication a year later when he led the Celtics to the 2024 NBA championship.Jaylen Brown opens up about his seeming struggles using his left handIn the 2022 NBA Finals, Draymond Green told reporters that their best strategy against Jaylen Brown was to force the star guard to his left. Once Brown went to his less favorable hand, the Warriors would trap him or send help from his blind side. The ploy seemed to work as Brown had 20 turnovers in the series, five more than any of the Warriors players.When the Celtics lost to the Heat in the 2023 Eastern Conference finals, Green pushed the same narrative. Brown had eight turnovers, five coming when using his left hand in the lopsided Game 7 loss to Miami.Jaylen Brown informed fans on his Twitch channel that he underwent wrist surgery in 2021. He added that he re-injured the same hand in the playoffs that year. Brown took the losses, never once making the wrist an excuse.Despite the criticism, the Celtics rewarded him with a five-year, $285.3 million contract roughly two months after the loss to the Heat.