The Ramhal tells us that prayer is a means of getting closer to Hashem.
Hashem and His blessings do not change, but our experience of Him and His abundance depends on our state.
Just like a dirty window lets in less light, or a window with the shutters closed or the blinds pulled down lets in no light, so with us and the effort we put into our prayers allows Hashem's light to come in to our lives.
How clean is it?
How wide or tall is it?
How far away from the window are you standing?