This is the 606th most frequent French word.
changer
To change.
Here 'changer' is reflexively indicating to switch or replace something, specifically clothes in this instance.
J'ai besoin de changer de vêtements avant de sortir.
I need to change clothes before going out.
In this sentence, 'changer' signifies altering or modifying a system or plan, namely a business strategy here.
L'entreprise a décidé de changer sa stratégie commerciale.
The company decided to change its business strategy.
This usage of 'changer' indicates a transformational action or adaptation, referring to a personal approach or attitude in this example.