Hey Quinn, Well you've met me(Marys Rainbow) many times over the years and I know Earth is Flat. re:you saying you havent met anyone who knows.
And all the children here (si is 17 already) know earth is flat too. We have spent a good few years now going over all of the facts.

Its not a belief system when you can prove something. Not sure what you are watching with the 5 & 10 proofs you referenced in this video, but Eric Dubay has had 200 Proofs published in book and on video ebook for a few years already so maybe you can check that out one day. He goes over clear proofs that anyone can research themselves in more depth.

Where does water curve?
Have you ever looked at the curvature math they teach the children in school (and adults go on into their adulthoods believing and even defending this math when they hear about flat earth)
Well, that math doesnt work.

Its sea level, not sea curve. Did you see curvature from your plane ride?
Is gravity a magic force holding things down? Or is it just density?

Question Everything,yes indeed.
Where is a photograph of earth from so called space that was can test ourselves and find accurate? The big blue marble photos from NASA change all the time.
Look to the people who have navigated by the stars for many years already, on the flat open seas.
And check out how the myth about ships disappearing over the horizon is easily debunked.. Zoom in with your cameras and see the ships come right back into view.. Not possible if there was this curvature they say exists. People everywhere swear there is a curve but cant prove it.

But us flat earthers can prove there isnt one. Anyone can prove there isnt a curve, thats the beauty of flat earth as opposed to a wobbling,tilting space ball ..Nobody can prove that magic things exists. Just search internet for the math if you want to test it yourself. Its popular now on internet, because its easy to prove, so you can find the math pretty easily.
8 inches per mile squared. Look up *curvature math