Exclusively pumping advice! Please.

I've been just pumping since my little was born almost 3 weeks ago. I can get the most out in the morning about 5oz from both sides put together, I really want to be able to get more out so I can start saving but it dwindles down to about 2oz each time from both put together every 2-3 hrs the rest of the day. How do I boost my supply?! Anything work for you moms out there that are just pumping? Pic for attention 😂