pumping milk

my baby girl is 3 months old now. I didn’t really take pumping milk seriously in the beginning, we didn’t live in our own home & I didnt wanna bottle feed so I never pumped. now that I wanna bottle feed, im not sure im producing enough. Im only pumping a couple ounces.

Im using the biggest suction cup size medela gave me, not sure if there are bigger ones after that. I know babies suction is more powerful as well. she has enough wet diapers/poops. she is also a chunky baby. so maybe im pumping wrong? its just not a good feeling seeing only one or two ounces pumped

any tips? can I boost my milk production this far in?