The Gita opens its teaching on action with a puzzle: if wisdom is better than action, why act at all? Arjuna's question in chapter 3 is a real one. Many people feel it too, wondering whether peace requires stepping back from responsibilities, or whether being busy is the same as being useful. The Gita's answer is subtle and practical.
Gita 3.5 says action is inescapable because everyone is driven by the qualities of nature, so the real question is how to act wisely. Gita 3.4 says freedom is not won by merely abstaining from action, and Gita 18.11 says embodied beings cannot renounce action, only its fruits. Gita 4.16 and 4.17 say that the nature of action, inaction and wrong action is subtle and must be understood, so avoid judging actions superficially.
The Gita also looks beneath appearances. Gita 4.18 says the wise see inaction in action and action in inaction, so do not judge spiritual progress merely by outward activity. Gita 4.14 says freedom from attachment to results prevents actions from creating bondage, and Gita 13.30 says the wise see that all activities are carried out by nature, and the self is a witness, so release the pride of authorship and the guilt of outcomes. Act wholeheartedly, and let go of the need to own the result.