I wish to become a millionaire in the most convoluted way possible.

Granted a chinese fisher eats some bad fish and takes a putrid dump into the Ocean the die shortly after. Turns that he carrie the long thought dead black plaque and he just relesed into the biggest body of water on earth. Everone is infected including 2 russian astronauts are launched into space and are hit by a small asteroid the wreckage og their ship hits a alien saucer and spreads the black plauge the alines using there advanced tech find a cure but not after all but one their crew died. The sole survivor not knoning how to pilot their ship since he was a bio chemist used an escape pod to crash on earth and land a little ways away from you and a friend of yours. You find the the alien dead from the crash after he didn't know how to properly land the escape pod. The alien cluching the cure in his hands. Your friend who has a backround of biochem stole the cure an grew rich producing and selling it abandoning you. This finally gives you the motivation to start your air freshener buisness. Turn out your air fresheners ate the best in the world and people become addicted to them. You make millions selling air fresheners.

Granted. You kill your sisters husband and marry her under a different name. After having a kid you kill her and wait for the kid to become 18. Then you marry her and then kill her and obtain the 2.7 million dollar inheritance which was bestowed upon the "great grandson of my sweet daughter of mine".

Granted, you are now Count Olaf from a series of unfortunate events

Granted, it’s because of you winning a lawsuit over an accident which caused your spouse and your many small children.