I decided to make a mask, for the fun of it and share it with you. It should fit your face as provided, but feel free to adjust as needed.
The attachment points are separate objects so you can edit their position if you wish.
Edit: I decided to make improvements on the design. Here are the changes:
added holes for ventilation in the nose and mouth areas
improved the internal space so there's a little more room for the mouth and nose
simplified the lower attachment point
I've added the .3mf and a files along with the .stl(I used Prusa Slicer 2.2.0)