While few people on this earth are equipped to acquire the "quality" of evidence that flat earthers inconsistently demand (personal observation with one's own physical senses has a greater "believable quality" than anything else that can be presented or learned), the flat earth theory doesn't even stand up to its own cross-scrutiny.

For example, flat earth often presents an entirely different visual/model to explain any single phenomenon. Day/night cycle? Here's one model. Seasons? Here's a totally different model. Eclipse? Jet streams? Anything happening in the southern hemisphere? Each scientific explanation has a different presentational model to demonstrate the phenomenon in flat earth theory. The moment you try to use the "incorrect" flat earth model to explain a different phenomenon that the model wasn't designed to explain, the flat earth theory immediately breaks. No "truthful observation" supports all other "truthful observations" through the flat earth perspective of inquiry.

There is no flat earth visual model that can simultaneously explain all of this planet's natural phenomenon at the same time.

The globe earth model doesn't have this weakness. Everything can be explained simultaneously, at the same time. Day/night, eclipses, jet streams, weather, climate, seasons, time zones, etc. Each observable phenomenon supports the truth of another. The supporting truths make it self-evident that the earth is indeed a globe.

In providing us tools to seek out and acquire knowledge, God didn't limit us to our 5 senses (see, hear, touch, feel, taste), he gave us a brain too. The scriptures are loaded with examples of how truths can be revealed/unlocked through ponderous thought and solemn prayer.