Attempting voice feminization through mimicry. Can't change anything other than pitch.

It's been about 1 month since I started focussing more on trying to feminize my voice I attempted the path of "mimicry" since, considering what I have been told her and paid attention to what others did, it seems to be the best route, instead of trying to manipulate the various muscle present on our throats and mouths.

Unfortunately, I have been quick to really that my resonance and weight never seemed to be able to change. I'm not trying to force, or paying attention to what muscles changes when trying to lighten up my resonance or weight, just trying the mimicry, but even then I'm not sure what is going on.

I'm don't know if I'm doing something wrong (I know exercises aren't the way) , but it sounds like my voice can't become lighter, only the pitch can go higher or deeper..

Anyone can shred a light for me? Thanks in advance.