I just can't seem to up my supply

I exclusively pump every 3-4 hours and bottle feed which worked out a lot better for me vs the pains and struggles with breastfeeding. Let's just say my mental health needed to switch over and it goes well. My son also sleeps for 11 hours so I no longer need to wake up in the night to pump. The problem is that I only get 140-150mls and I need to get 180mls now. Thankfully I have extra frozen bags to top up each feed but that isn't going to last very long! Any tips on getting my milk supply up? I pump 5 times a day, I drink nursing tea twice a day, eat oats in the morning and take 2 eclinols a day to encourage milk production. I also drink 2 litres of jungle juice but it just won't get to 180 mls per pump (20 to 25 mins at a time).