Increasing Supply post 12 months?

Hi All!

I have been EP for the past 6 months. Recently, my daughter turned one, which is when I initially planned to stop, but she is starting daycare in a couple of months and I'm now paranoid and would like to keep going for her first few months of daycare (to see if it has ANY preventative/alleviating effect on illness).

However my supply seems to be going down... I was doing 5ppd and getting 20-25 ounces, and recently that's dropped to about 18 (and sometimes less than that). I'm wondering if this is just bodily exhaustion, or if there is something I can do to increase it?

Any insight at all is very appreciated!