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I have flipped a 27 acre lot before, but that is all.

Do you know Jack Bosch? He is a german immigrant in the USA and he offers land investing and land flipping courses in the USA. I'm observing his recommendation at the moment because I'm not sure it it is really possible and advisable to invest in american land as a german;-)

I do not know him. I think it could be possible, but tough to pull off. Here is a podcast I did with a land investor. https://investfourmore.com/2017/04/05/podcast-95-creating-passive-income-by-buying-land-with-mark-podolsky-land-geek/