Supplementing mamas?

I supplement my baby, he gets a bottle during the day and breast through out the night, which should be good if I wanna work, but right now I wanna full on breastfeed, but I’m scared, because it requires so much time even though I have a lot of it, I just feel like I don’t have enough milk lol I usually fit in two feedings during the day and that’s it he’s fussy on the boob except when it’s bedtime, I been taking fenugreek but I was wondering what else can I take? I try oatmeal bars as well. And how often does a 3 month old breastfeed all day? 🤔 i don’t wanna buy my nurses anymore because I been texting her all week for advice 😂