Supply and demand during night and day is opposite

Abby
So my 9 wk old sleeps in 3-5 hr stretches at night which works out well because it gives my milk time to replenish.  However during the day, especially the morning all he wants to do is breastfeed, and my milk is depleted. He then gets hungry and I have nothing left so we supplement. Any suggestions on reducing the cluster feeds during the day?