6 months and no supply

I am EBF and have been for 6 months. I pump at work 3 times and drink as much water as I can and take fenugreek. Just recently my period has returned and my son has started sleeping through the night. My supply took a direct hit and I went from pumping 16 oz a day to maybe getting 6. I'm really disappointed because I love breastfeeding and I really want to make it to a year. He's started solids but that doesn't replace any of the bottles or how frequent he nurses. I am at a loss of what to do. Does anyone have any suggestions? I'm going to give lactation smoothies a try and mothers milk tea.