[go] on the offensive

to take actions or attack aggressively in a conflict or competition to gain an advantage

The army decided to go on the offensive and launch an attack.
In the debate, he chose to go on the offensive by presenting strong arguments.
Let's be prepared to go on the offensive in negotiations to secure the deal.
Going on the offensive can be a strategy to gain the upper hand in a competitive market.
The team went on the offensive in the second half of the game, scoring several goals.