Breastfeeding

Okay so I had my son 5 weeks ago and had to supplement formula and breast milk to get more weight on to him bc he was not gaining enough and I was not producing enough milk so now i want to get him back to strictly breast milk I completely understand I will have to use formula still ! I have used fenugreek it’s helped but I only produce just enough for him to eat . If any one has any suggestions on how to get breast milk back up and still be able to have back up please let me know!!!!