How to up supply

My oldest was sick last week and I wasn't able to pump as much as I needed to to keep my supply going. Is there anyway to up my supply again? My newborn(5 weeks) has a lip tie I'm having looked at tomorrow and hoping to get him nursing. But my supply has dropped drastically...like I'm not even getting an ounce anymore from each boob.

I'm so sad if this is the end...

Using a spectra.