The size can be reduced as needed in the Prucaslicer. I have printed them so large for my daughter. Took a while, but her joy was worth the wait.
Note: I unfortunately still have little experience in slicing. The support materials may not be necessary everywhere and it is laborious to remove them. I welcome tips, advice and anything else that comes along.
I have downloaded the 3D model of the mermaid free of charge and license here. I then hired someone else to make clean STL files from it. I paid for that out of my own pocket.
I have also uploaded a low-poly model.
The author remixed this model.