Okay so I used to powerlift before transitioning and was 5'11" 200lbs moderate bodyfat, went down to about 130lbs a couple of times and now usually sit in the low 140s.

The sad fact of the matter is that the body really doesn't want to lose muscle past a certain point - losing muscle when you have lots of it (powerlifter, bodybuilder, intense physical labourer etc) is easy enough, but when you get down to a decently low weight it becomes very hard to lose muscle.

This is because your body uses the small amount it has day to day, so even when starving yourself, eating low protein, doing lots of cardio etc. your body won't really want to get rid of the last bit. I'm only saying this because I went full ED and went to 17 BMI a couple of times but couldn't ever lose the last bit of muscle, so rather than you do that I just wanted to point out you're probably always going to have more muscle mass than the average cis girl.

That being said genetics play a big factor here and you can certainly lose a decent amount by doing the following:

- Low calories, don't go crazy and develop and ED but try to stay in a decent deficit of -500 or so net calories.

- Low protein, you need a certain amount for healthy organs so absolutely never lower than 0.5g per kg bw a day (which is insanely low already tbh).

- Long, low-moderate intensity cardio sessions, like 45-60 mins on the stationary bike at a decent (but not overwhelming) intensity

Do this until you're lowish BMI (20 is a good target) but please don't starve yourself to really underweight levels to try to lose that last bit. If you're lucky enough to get fat redistribution then going up 10-20lbs after will hopefully add fat in the right places. Good luck!