@zghorner,
I've got big respect for you to go public with this - alone because of the comission alone, it's almost impossible - not 100%, but almost impossible to win in the game of daytrading.
Markets are so efficient that beating the S&P 500 by a wide margin is extremely difficult, as you experienced yourself.
My idea, and it is slightly controversial, is a (kind of) vice investment. The old Philip Morris company's stock was one of the best investments ever, since 2008 you've got two companies representing this former one company,
1) The US business is Altria, ISIN : US02209S1033
2) The rest of the world is Philip Morris International, PMI in short, ISIN : US7181721090
The dividend I'd simply reinvest in the company's shares. They pay out 4 x times a year each.
So your remaining cash would be 50% PMI, 50% Altria.
Hope this will work out for you if take this route.
https://money.cnn.com/2015/02/19/investing/americas-best-stock-ever/
If you don't want a concentrated bet in one industry, I'd simply invest in a low cost index fund on the Nasdaq 100, NDX in short.