Milk supply dropping

I used to be able to pump 2oz easy, maybe even a little more. My boobs would be hard & full.

Now my boobs are soft & barely hard lol. I can only pump 0.5oz out of each boob. My baby has been in & out of the hospital for his jaundice, so I’ve been breastfeeding when we are out of the hospital & pumping when we are in the hospital (because he won’t latch when he has his goggles on & I can’t take him off him bilirubin light). I’ve been having to top him off with some formula which kinda sucks but it’s better for him… I just don’t want to lose my supply cuz this is my first time breastfeeding & I love it. I’m on day 9 of breastfeeding & my supply just slowed down early today.

What do I do? I’ve been drinking water & whatnot. Do I pump more often? Less often? I last pumped at 2 & it’s now 6pm & my boobs aren’t full.