Accepting what is doesn’t mean doing nothing, although that is a choice, of course, it means not suffering the pain of resisting something that can never be changed.
The situation you are in is always the present moment and anything that has occurred in that moment, within a nanosecond of you being aware of it, it is already the past.
Normal unconscious mind possessed behaviour means that what is occurring doesn’t fit our story, the ego does not like it, so it resists, it fights, it denies the absolute truth of the present moment. The fight, the resistance, all the negativity in our mind creates the emotion/turbulence in the body which is the mental and physical suffering of not accepting the external world and what is.
However, once we accept what is the pain goes, peace comes, and we can act or not according to what our true self is feeling. We respond from a place of peace, love and our soul. We do not then respond from our egotistical mind possessed state and we do not become the emotion, we are not the reaction.
Letting go and acceptance is the route to acting consciously according to what is truly right for our soul.