So here we are, none of us know the truth 100% but we accept there are two scientific models that could possibly explain our world: flat-earth theory and round-earth theory.

The wiki's FAQ states:

"when using Descartes' method of Cartesian doubt to skeptically view the world around us, one quickly finds that the notion of a spherical world is the theory which has the burden of proof and not Flat Earth Theory".

I find this proposition fascinating because it forcibly makes most debates between the two models follow this formula:
A) round-earther poses a "proof of spherical earth" such as boats disappearing below the water, space flight, astronomy, etc.
B) flat-earther counters that proof with an alternative explanation for the phenomena such as psychological biases, the NASA conspiracy, and any alternative scientific explanations
C) the debate ends in a standoff. Both sides simply accept and are comfortable with their own explanation and fail to make the other side uncomfortable enough with their model to switch views.

I'm a round-earther. But I don't want this post to be a debate on any specific phenomena or scientific theory. Rather, I'd like to challenge flat-earthers with the following philosophical questions:

1) The burden of proof is actually shared. I'm failing to understand how "one quickly finds that the notion of a spherical world is the theory which has the burden of proof". I am a tiny speck on an enormous world. The world is so enormous that my senses alone could not detect whether or not the curvature in the world if it existed. If you think you would be able to detect the curvature of the earth from your human senses without being really high up, you misunderstand how large the world is. Therefore, I find that the burden of proof is shared between both sides
2) According to Occam's razor, one should select round-earth theory. Cartesian doubt, mentioned in the wiki, means that you start any line of thinking by acknowledging that you don't know most things and there are only a few ground truths you can rely on. So let's say from the beginning, one does not know the shape of our world. Next, they learn some of the essential phenomena that would occur in both models. For example, in the flat-earth model, there is a wall of ice beyond which is the edge of the world. In the round earth model, Antarctica is a continent on the bottom of the planet. If the burden of proof is shared equally between both sides (as I proved in point 1), the flat-earther simply needs to provide evidence for the wall of ice and the round-earther simply needs to provide evidence for Antarctica.

Here is my evidence for Antarctica: the second image on this webpage: https://svs.gsfc.nasa.gov/vis/a000000/a003400/a003402/index.html

Now, I know for a fact that flat-earthers have counter-arguments against this image's validity. But because
the burden of proof is shared, this is still the winning empirical evidence until there is an equal or more convincing image of the wall of ice or whatever lies beyond it. In other words, Occam's razor says you should select the theory with fewer assumptions. For flat-earth theory to be true the assumption is that there is a global conspiracy centered around NASA. For round-earth theory to be true, the assumption is that there is no picture of an ice wall because there is no ice wall. Which is the lesser assumption, the existence of a global conspiracy, or the non-existence of a mysterious ice-wall?

This leads me to my third point:
3) Flat-earth theory, while claiming to be a science, is believed unquestionably and without doubt or scientific rigor. A scientific theory must be falsifiable. And the degree to which a theory is true directly corresponds to how rigorously it has been tested and proven to not be false. The round-earth theory is extremely falsifiable. If space travel is not possible, simply show me a picture or video of the edge of the world from a plane, boat, or antarctic expedition.
If I saw a valid picture of the edge of the world and came to terms with NASA being a conspiracy, I would change my belief. This however makes me even more confident in my round-earth belief, because I know no such image of the ice wall exists. So I ask flat-earthers, if a picture of Antarctica is not enough, what makes your theory falsifiable? What evidence could possibly exist, that would make you change your belief? What evidence would you expect to exist if the round-earth theory was true that you are missing?