PSG were dominant so do not need to change tactics. They can win the game in England if the play the same way. PSG deserved to win they had 27 shots on target. Liverpool had 2 but scored against the run of play.
Even if PSG doesn't need to change their tactics, they must adjust it with the next tactics applied by Liverpool. I'm very sure Liverpool will change their tactics because it looks very badly today. It was just lucky that Liverpool still could score 1 goal. In the next Leg, Liverpool may not be lucky again if they apply the same tactics. However, for PSG, I think their need to give special exercises for their attackers to improve their shot accuracy. Today, PSG attackers wasted too many chances for scoring goals.
PSG performed exceptionally well in this match compared to Liverpool and their attacking line was much stronger. But unfortunately PSG's attacks were not able to be completed properly and failed, moreover Liverpool's goalkeeper defended a lot. However, although Liverpool could not attack very strongly, they still scored a goal, due to which they are ahead, but they defended very well. However, seeing the situation of this game, Arne Slot must strengthen his strategy and change the game, otherwise there may be no hope of winning the next match. If Liverpool can change the game in the next match, then victory is definitely possible, and since PSG has wasted many opportunities to score goals, they will improve this aspect further.