Milk supply still not improving

BM takes about 3 mths to become stable. I'm struggling with low milk supply too but I also top up with fm. I do have a huge stash of frozen milk just from the Haakaa which I use for 1 side when baby is nursing on another. From there I manage to build a stash although 1 time letdown will only let me yield 30-50ml depending on how long my baby nurse. I stopped pumping with my electric pump bcos it's too much work and I hate the washing part. But hand express works the best! I'll always hand express after my baby finished nursing and normally I'll get an extra ounce. My baby also sometimes rejects fm and only like to nurse & vice versa. And sadly he also refuses to drink my frozen milk as I have high lipase bm so now I only DL baby on demand. I took Legendairy Milk supplement but too expensive for a homemaker like me and it didnt work. So far oats drink works for me. I drink the one that sells at supermarket. Can't remember the brand name but it's oats & quinoa. Does not have to do anything with breasts size or capacity. You just need to empty them often which gives your breasts the signal to make more milk. More empty, more milk. I follow lactation nurses in IG which are not from SG and their posts helps me alot to understand more about breastmilk.