Breastfeeding help

Celine 🐷 • 💙💙💙
I've been breastfeeding and pumping for almost 3 weeks,  my supply has gone down significantly I'm not pumping as much as a few days ago,  I'm so worried what are some ways I can increase it?  He wants to be on my boobs 24/7 but nothing seems to come out and he's still hungry! Help 😰