Milk supply question

Hey there, I have a question on milk supply. I’ve been pumping exclusively from about day five and have been keeping track of my output due to having low supply with my last baby and pumping for a year. The most I made was about 20 ounces. With this baby I got up to 27 ounces and around 3 1/2 weeks. I met with a lactation consultant who told me that I could go four hour stretches overnight without pumping if the baby was sleeping. I did that for about a week off and on and now my supply is taken a huge hit and I am back down to around 21 ounces.

If I start to pump every three hours, will I see an increase at five weeks postpartum? My boobs have already started to soften and not get engorged however, I am leaking still on one side. not sure if that matters..

Seeing that I could make 27 ounces was so encouraging and now that I’m back to 21 I feel very discouraged and a little worried.. any and all advice welcome