Supply tips

I’m almost 8 weeks PP and I Exclusively pump

The first pump of the day I get like 6-12 oz.

And then I get 2-5 oz every 2-4 hrs .

How can I boost my supply ? I want to get a storage going but right now I only have 30oz in the freezer and 9oz in the fridge & my son intakes about 4 oz a feeding !!!