Umm... how do you intend to use the bathtub meaningfully? And the toilet in a niche that looks less than 80 cm wide. Sorry, but like this, the bathroom is not a bathroom, but a collection of bathroom fixtures.
And with the staircase, there could be an overlapping problem, since the stair opening on the upper floor only begins after the first 2 or 3 steps on the ground floor. Especially when going downstairs, this is often annoying for people over 170 cm.
Maybe you realize that it is simply not enough to just move a wall a bit somehow.