Need tips!

My daughter is 18 weeks old and EBF. I went back to work just before she turned 12 weeks. I pump at work and nurse at home. At first I was getting more than enough milk for the day, but now I can't even get enough for 3 bottles! She takes 4 4.5oz bottles while I'm at work because I'm gone 14 hours. Not sure why my supply has tanked so bad but I'll take any tips to increase it! Currently taking 4-6 fenugreek a day, power pumping 4 nights a week (days off), not sure what else to do :(