Best way to utilize pumping

My LO is almost 4 weeks and I am breastfeeding, but he has taken a bottle about 4-5x in a week (mostly breast milk but has also ate formula). I feel like I am a “just enougher” and will get about 2-3oz per pump session.

I am wondering what is the best way to utilize pumping to either build up a bit more supply so I can ensure my baby can bottle feed breast milk at least once a day—should I pump after a feed or pump on the other breast when my LO only eats on one side? I don’t wanna create an oversupply but I do think I can increase my supply by a bit. Any tips appreciated!