the stars are not constant and fixed, we are all moving together around the galaxy at the roughly the same speed so it gives the appearance of being fixed.
your butterfly analogy is completely flawed i'm afraid, why do you think it sits prettily on a leaf, because gravity allows it to do so, it doesn't just float off into space
https://howthingsfly.si.edu/gravity-air/buoyancy
allow me to ask a couple of questions i know you won't answer but anyway
just say we are flat - how far do we extend as a flat earth? i assume we have a beginning and a end
for simplicity i will assume we have 4 sides to this flat earth(we may have more who knows) what are the 4 nearest towns/cities to each edge/side, all this in depth research you cite must know this
as we are flat, we will have a top and a bottom yes? what is the depth, and with a depth we have a shape