When looking at the oppression of innocent people across the world I feel hopeless that I can't do anything for them. Is giving charity enough? Will Allah (SWT) accept my Duas when I have not taken other actions for them?
You can give charity on their behalf, pray for them and also bring awareness to others about their situation. We must pray for the return of Imam Mahdi (aj) which is the solution to end the oppression in the Earth.
According to a prophetic narration, we must stop oppression by our hand if we are able, if not then we speak against it and if we are not able then the last step is to hate it in our heart.