I think there are many compelling reasons to look into flat earth.

The suggestion that earth's atmosphere is held together by gravity, while it sits next to an infinite vacuum simply defies anything we know about physics. If space is vacuum it would be impossible for our atmosphere to exists without a solid barrier ("firmament") containing it.

It is absurd to suggest that the moon orbits around the earth in a perfectly predictable manner, like it was on rails, and this is from "gravity". Meanwhile the earth orbits around a sun in the same manner, in an exact same pattern for 1000s of years. all these forces at work moving balls millions of miles without one iota of decay or change. invisible strings is a more convincing argument than "gravity". Any scientific experiment regarding centrifugal force or attempting to model these type of orbits will invariably show decay and the 2 objects eventually collide or they fly away from one another. the predictable and reliable movements of the bodies in the sky simply has not been adequately explained by modern "science"

while not a proof of flat earth, the fact is NASA has been faking their space activities for 50+ years. They fake their photos of planets and the earth. Their videos of moon landings do not hold up as believable. There are videos showing fakes missions with the space shuttles. They are caught faking stuff with green screens on the ISS to this day. If they can't show us real videos and photos of the globe and space, why not? Its a valid starting point to question what else we are lied to about.