Third vote for getting a professional involved, but i'll still offer my layman's suggestion given that you're just soliciting general ideas at this point. If it was my space, I'd switch the bathroom and the laundry room around, keeping just one of the walls currently enclosing the toilet. Its hard to estimate precise measurements from the drawing, so it may not be feasible, but here's what i mean

Will need to see layout to give opinion. Doesn't look like a free standing tub is a good option for you but if you show us the layout we can give you an accurate advice.

Hi Cathrine, just a little sketch here for your tricky little bathroom. I was trying to get a bigger bath in, hide the toilet behind the door and have a vanity with lots of storage. What do you think? Let me know if you want to explode this any further. Thanks Gunnar