This is the 9879th most frequent Russian word.
агрессивнее
More aggressive.
Here, 'агрессивнее' describes the increasing aggressiveness of one's strategy, implying it's comparative.
Его стратегия становилась все агрессивнее.
His strategy was becoming more aggressive.
In this sentence, 'агрессивнее' suggests a comparative intensification of how actively or assertively the actions should be carried out.
Мы должны действовать агрессивнее, чтобы добиться успеха.
We need to act more aggressively to succeed.
Here, 'агрессивнее' compares the level of assertiveness in the players' performance before and after a specific event.