The 9 of wands has to do with acceptance...accept yourself and your circumstances as they are.
But that is not to mean that you give up hope of change, or stop acting on behalf of things you believe in...most of all not to give up on your own growth and learning.
Acceptance is a very different thing than hopeless resignation...
It is a warriors card. It is a card of acceptance, yes, but this implies realism and pragmatism, not hopelessness. It implies practicality, not resignation.
This card reminds us to play the cards we are dealt. It says nothing about giving up on the game.