How to increase the volume of breast milk per session?

How can I increase the volume of breast milk pumped per session?

I range from 16-20oz per 24 hours. I pump 8x a day with overnight sessions. I am using a spectra s1, got fitted on flanges, and taking legendiary supplements. I try to get 7-8 hours of broken of sleep a day. I don't want add more pump sessions since it's already challenging taking care of the LO and my current pump sessions and my husband goes back to work next week. I also had gestational diabetes, so I'm trying to be careful on my carb intake. I am 5 weeks postpartum.