Trying to reestablish supply

I stopped breastfeeding and pumping 2 weeks ago due to being sick and being on multiple medications and my daughter is 4 weeks old and has been eating 4oz of formula every 3-4 hours. I started pumping again yesterday and got around 3ml which is basically nothing. I breastfed right after and then had to give her a bottle 30mins later because she was still hungry I really want to reestablish my supply and cut out formula entirely I need advice!! Please help! What should I do!?