The first step towards being “high agency” is always the same. You cannot take effective action towards bending the world to your desire until you know, in detail, what it is that you desire.
Reminder that a sense of agency means feeling like you have control over your actions and their consequences . I think people tend to forget that second part; owning your mistakes and their consequences is extremely difficult, which might be a motivating factor for some people to adopt victim complexes. (A victim complex is learned!)