Milk decreasing ☹

The past week or so I have noticed that my milk output has been decreasing. I use to be able to pump 30 oz in 1 day. I am now down to 20 oz at best. My son consumes anywhere between 20-30 oz in 1 day (because hes a little fat man). I have been drinking water and Gatorade..I have been drinking mothers milk tea, taking Fenugreek as well as eating oatmeal and other various foods that are suppose to boost your milk. Does anyone have other suggestions as to what I can do to boost my milk??