INCREASING BREAST MILK

Latanya β€’ I’m a Social Worker-elderly and disabled population. i have two boys ages 4 and 2 with boy/ girl twins on the way!!!
Does anyone have any recommendations that ACTUALLY worked for you????! I thought I had enough milk stored to last a year so I have been pumping maybe just once a day but it looks like it will only last until he is 9 1/2 months πŸ˜”πŸ˜”πŸ˜”πŸ˜”πŸ˜”.. I'm only pumping 1.5 ounces combined 😩.. what can I use to increase my supply or is it to late?