I've got a good one: manufacture and deal fentanyl. Demand through the roof in the US, and China has lifted supply restrictions on the base ingredients.
Just make sure you arm yourself and stay away from Mexican cartel turf. You'll make a killing haha
I will raise yours. Instead of concerning yourself with manufacture and purveyance start an organisation to legitimise fentanyl. Call it something relatable like "The National Fentanyl Association".
Produce slick marketing campaigns like "Fentanyl don't abuse people. People abuse Fentanyl" or "the only way to stop a bad guy with fentanyl is a good guy with fentanyl". Organise superPACs funds for US politicians with cartel money.
Finally end with an Organisation of Fentanyl Producing Economies - OFEC with China,Mexico, India and Afghanistan to start with...
And begin your private jetting lifestyle, like what Tom cruise said to Matthew McConaughey in the 2008 movie Tropical Thunder "No more frequent flyer points for our boy here"