Chelsea's biggest plan was to attack PSG's confidence and they succeeded in that plan. Chelsea's plan personally seemed great to me. They started playing aggressively on PSG from the start and completely destroyed PSG's confidence. Although Chelsea's plan was very risky, they used their experience and courage to win the match against PSG by a large margin.
Usually this is the exact style PSG uses against other opponents, they finally got a doze of their own pills and it never tasted as nice. PSag would speed up games in the first half, gat a goal and place a threat on your confidence. Chelsea understood this and slowed the game in the first half which they grew into taking charge and full possession then they executed their attack on the confidence PSG had, and before PSG could realise it, they were 3 goals down, that was how Chelsea sealed their victory and brought PSG to their biggest loss after having very high hopes.