Help! Picture included of my little man

So I exclusively breast fed for 10 weeks. I now have been back at work for a couple weeks and a couple things have come up. First my son rarely wants to breastfeed anymore, sometimes he will latch but most he just screams and cries and refuses to latch until I give him a bottle, we are on the slowest flow bottle possible so my first question is there any benefit to trying to get him to latch or should I just give up and only bottle feed? My second question is I only get 2 sometimes 3 ounces when I pump so my son is getting about 15 ounces of breast milk then an additional 10 or so ounces of formula. Is there any way to increase supply? It is so discouraging pumping and then still having to use formula as well

And yes I drink a lot of water, I’m going to start eating oatmeal to see if that works and I ordered new pump parts but I’m pretty sure that is not the problem