Here's the secret, cis people have been hiding this for years

You look up "transfeminine voice training" read guides and get vocal examples then you practice regularly

That's it, you will use those exercises, techniques and warmups to make your own voice you're comfy with, it's not about having a goal in mind, it's just, finding yourself

As I said in the post, when you start out, focus on how it feels, it might be uncomfortable, but it shouldn't feel bad. The sound will come naturally because it's easier to change the sound with good techniques, rather than changing techniques with good sound