If you know nothing about farming, and it's in Yemen, I would sell it to the highest bidder. Reasons?
1. You're not going to change the locals' minds about how to grow this because A..... They have been doing it for hundreds of years, and B.....you know nothing about farming. You said it yourself.
2. You can't fly overseas from America anymore because of the COVID restrictions. Especially to a place like Yemen and especially for the purpose of growing a crop that is illegal in America.
3. You would have to sell it in the parts of the world where it's legal, so it's not so much about not knowing how to farm anymore. It's more about foreign commerce, trade, laws and the different currencies / exchange rates.
Sell it dude. Whatever you get out of it will be all profit. That's the good thing about a bad inheritance. Take that profit and invest in medical marijuana growing operations.