A belief is really only a thought that you keep thinking.
When you say "Yes" to something, you include something you do want in your experience. When you say "No" to something, you include something you don't want in your experience.
Your action has nothing to do with your abundance! Your abundance is a response to your vibration. Of course, your belief is part of your vibration. So if you believe that action is part of what brings your abundance, then you've got to unravel that.
Whatever belief I am practicing the Law of Attraction will validate with evidence.