Hello everyone ????, I don't know if it's just me, but I have problems…

Hello everyone ????, I don't know if it's just me, but I have problems with my baby, he doesn't get enough milk, I supplement with formula. My child has been doing everything we were told for a month, I drink tea often, nothing helps, the child gets angry because the breasts are empty and there is nothing to pull out. I expressed about 20ml at a time. Do you think this is only my problem???