Uh…most people have jobs, but job ? parnassah.
Parnassah comes from Hashem period. You have to do hishtadlus, but it’s not the hishtadlus that brings the parnassah.
And the point of saying Parshas haMon is not to be a magic trick or something. The point is to increase our bitachon and internalize the concept that parnassah comes from Hashem.
Being aware that parnassah comes from Hashem is what brings parnassah.
And that is the point of saying Parshas HaMon. Really, we are supposed to say it every day, but if that’s too hard, at least it should be said once a year.