Others will have to answer you about Fenugreek. I had mild gynecomastia as a young man. I used PM for a while but not long enough to see a difference. I attribute the growth of my breasts to regular nipple stimulation and breast massage over the years. The stimulation produces the hormone prolactin, which contributes to growth. I also use progesterone cream, which I believe has been a major factor in the softness of my skin and the heightened sensitivity of my nipples.
If you are curious you can see my breasts here. https://www.breastnexum.com/attachment.php?aid=20562
If you are curious you can see my breasts here. https://www.breastnexum.com/attachment.php?aid=20562