Have you ever experienced seasons? What about the horizon? What about time zones? What about tides? What about polar night or the midnight sun? Have you noticed how the peak sun angle gets lower as you go further from the equator, resulting in colder climates? Have you noticed how the angle at which the sun sets gets shallower as you get further from the equator until at the poles it's completely horizontal and it just circles around in the sky for half a year?

Yeah, all of those things are impossible on a flat earth and easily explained and predicted on a round one. Flat earth theory is living proof of the Dunning-Kruger effect, nothing more.