The Boston Celtics are facing a must-win Game 7 against the Philadelphia 76ers, and after two straight losses, the series momentum has shifted. Here's what Boston needs to fix to advance and face the New York Knicks.

First, the shooting has to improve. The Celtics have shot below 30% from three-point range in all three losses this series. Even more alarming, they've hit just 59% of their free throws over the last two games—a far cry from their regular-season average of 80.7%. In a Game 7, every point matters, and leaving easy points at the line could be fatal.

Second, ball security is crucial. Boston led the league in fewest turnovers during the regular season, but they've lost the turnover battle in each of the last two games. Those extra possessions have led to easy transition points for Philadelphia, and in a win-or-go-home game, those mistakes are amplified.

Third, the Celtics need to dominate the boards again. Boston was one of the NBA's top rebounding teams this season, while the 76ers were middle of the pack. Yet over the last two games, the teams have the same number of rebounds. Being more aggressive on the glass—especially on the offensive end—can create second-chance opportunities and limit Philadelphia's fast breaks.

If the Celtics can knock down their shots, take care of the ball, and crash the boards with purpose, they have the talent to close out this series. It's time to put it all together when it matters most.