Ideas for bathroom layout 8-9 sqm with sloping ceiling

Hello,

I am struggling with our bathroom. The bathroom was already planned to be somewhat small, but due to various regulations, we had to make it even smaller.
Anyway - these are the current measurements.
2.45m x 3.35m and the knee wall is 80cm with a slope of 48.5 degrees. The measurements include plaster and tiles.
I roughly copied the plan as best as I could. The door opening is indicated as 79cm in the plan.
What bothers me the most is that the space between the shower and the bathtub is absolutely useless. You can’t put anything there. Also, you have to enter the shower at an angle because the sink is on the other side and would block the entrance.
I have tried various "bathroom planners" online, but I haven’t really warmed up to any of them. The shower has also turned out to be relatively tiny. I have attached photos of it as well. Maybe there’s one or the other creative idea here that I can pick up.

Best regards

What bothers me the most is that the space between the shower and the bathtub is absolutely useless.

Then just make the shower bigger ... you don't have many options.