The best plan for maximizing your wealth in a single day involves the following.
Pre Planning Steps (not in any particular order)
Pick a very busy day in sports, in the United States this will likely fall sometime in Autumn when you have professional and college football, professional baseball, professional basketball, hockey...etc.
Take out a large reverse mortgage on penniless Joe's home
Travel to Vegas. Spend the very busy sports day documenting all the games being played. (it would help if you can carry over a notebook from one day to the next, but if not he could get the scores and stuff tattooed on himself).
Spend some time with a few whales in the casino and keep track of their day to convince them on the repeat day you can make them a lot of money if they invest in your day.
Find a stockbroker in Vegas for ease of access when you choose to repeat the day. Again, make sure they know you, call them and see what things happened during their day so the next day you can more easily convince them to maximize your time/money.
Repeat Day
Get up really early, meet with the whales and call your stockbroker to get them in on the plan. Take your mortgage money and any cash from the whales and invest in the market based on what you know you can make, waiting for a day where there were big changes will obviously make you more money.
Use some of the money to hit sports books around vegas and spread your winning bets around (no one wants to get broken bones by making a casino think you are cheating) bet big obviously the crappier the odds the larger the bet...putting it all on one bad bet you know will come through is efficient but...spreading things around should draw less attention...until tax time at least.
Enjoy the day, have some drinks, gamble (though I should mention that gambling won't be certain since you are likely creating an alternate reality by gaming at table...where you change the dynamic as opposed to sports and lotto betting)
Bet the lotto...obviously. Wait for a large jackpot that no one else wins (no one wants to share a jackpot afterall)
Hire a wealth manager
Profit...
Visits from the NSA, FBI, IRS, and other agencies who are going to be very very suspicious...