Drop in pump output

First off I know pumping isn’t an accurate indication of supply and my son seems full after nursing so this is strictly a pumping issue.

My son is 8.5 months and I’ve noticed a decrease in my pumping output. Where i was normally pumping 5-8 oz I’m now only getting 3 if I’m lucky. I have ordered new pump parts that should be here tomorrow that I’m hoping will fix the issue but I was wondering if anyone had any other ideas about how I can give my supply a boost? Any supplements or foods that have worked for you? My son goes to daycare so I have to pump so he has milk during the day. Any help you ladies could offer would be amazing!