Put together a portfolio of negatively correlated automated strategies. At least you can get some backtesting data to work with. Putting together a portfolio is not easy, but it's doable. You're not going to double your money with a single trading model unless you think you found the holy grail. You may as well shoot craps in Vegas - least the drinks are free.
options are the way to go. Get tipped off by an option derivative specialist ONE TIME. Quadruple your money on a takeover call or puts on a company going bankrupt like AHM. Get greedy and do it again. Park the millions in a nice interest returning CD or bonds and live off that. Do some losing deals to get the SEC off your back. Move out of the country.
Another way to gamble for 100% profit ...is to make 32 simultaneous equal sized bets on 32 of the 38 numbers on a single roulette table for 12.5% profit. Your basically betting on 6 numbers to "NOT" come up. Do this six consecutive times while compounding the winnings and you will double your money if you haven't lost your bankroll first. Each time you make such a bet you have a 15.8% chance of losing.
this does not have a 90% chance of success. more like 10%. sorry, but the only way to achieve the OP's goal is to buy a handgun and hold up a bank. there's a 10% chance you will lose your $50k (posting bail) and lose your freedom too.
You may want to compute the moneyness of the proximal strike before uttering more diarrhea comments. It's approx a 50% probability of earning 6x your stake based upon projected vols at 1600. 60% touch probability at current vols. Would you like to sell me that DNT? I'd love to take the touch off your hands. FWIW, it's a phenomenal sale of upside gamma/vega at the current vol-line. If you can't see that you'll never get it.