Is it even worth it?

So I am pretty much just formula feeding but I will pump here and there when I get a chance and give my baby some breast milk every day. It’s not a because I don’t really have the time to do it and I know that the less you pump the more your supply goes down, I am aware. Sooo my baby is only getting maybe up to 5oz of it a day, sometimes a lot less. Should I just stop pumping altogether and just do formula? I’m not sure if giving that little amount even does anything or is worth it ..?