In my opinion, Lucca, yes, and yes.
It is very difficult(but also necessary, or at least it was for me) to speak femme for long stretches at a time; and it's definitely not something I would recommend doing right away.
I think your voice doesn't really sound weak, it IS weak, you are cracking all over the place, hun! I think you should calm down on practicing your voice and focus a bit more on your muscle control in your neck and stuff.
Unfortunately, I wasn't really hearing girl so much, but right at the beginning and also at 1:10 or so, you sounded completely female to me. Sometimes it can be certain phrases or what not that help, too. And it does take a lot of work to maintain your voice properly when speaking for longer than a few sentences.
It seems like you get it very close to right when you're thinking about it, but when you start to do it(maybe caused by the strength of your vocal chords) you struggle and then the sound isn't as smooth as it used to be.
I know that feeling very well, but right now for me, it's kinda the opposite. When I first start talking, it comes out a bit 'off' and then after I've said a few words, I can 'correct' myself and then focus more on the intonation, etc.
For me, what was always my training(and still is) go-to is "The Raven" by Edgar Allan Poe. My wife says that's a terrible thing to practice in a female voice lol but it works for me!
See, part of thing I think is, if you have something like an opening line of a book or a poem that you've memorized, and you recite it over and over- you start to know how it sounds in your head and have a better idea of when you're improving or what you should sound like. I do read all sorts of things, but if there's nothing to read, I start reciting that poem again. If I didn't have a go-to series of lines that I have memorized, then I think it would be much more difficult for me to really notice when I am making positive progress.
Similar to how I said you sound in the beginning and at 1:10 of your recording; if you can pin-point the moments/phrases spoken when you sounded your best, you can begin to understand how(for you) to apply that same feeling to other things. I notice this more closely with music, too; because some songs just flow out more naturally and it isn't totally reliant upon who the singer is.
