This list is a list of points that disprove normal flat earth theory,
1. Measurable variations in gravity would tear the disk apart if there was a universal accelerator, since if different parts of the disk were accelerating at different rates.
2. Foucault pendulum.
3. The corolise effect, visible in hurricanes.
4. The sun should change shape as it moves across the sky, and it shouldn't cross the horizon.
If you can't disprove all four points then FET is wrong.
As a bonus, reasons why RET is better.
1. We have working maps.
2. We can work out the paths of the planets in advance.
3. We can predict eclipse.
4. We can predict the motion of the stars.
Mainly it can make accurate mathematical predictions, something none of the other models do, and don’t start saying “We have no resources”, learn geometry and make a few working equations to find the motion of any planet or star, problem is this can’t happen because your models don’t work.