Here is a simplistic strategy that can add leverage to an IRA for better absolute and risk-adjusted returns.  Inspired by the Seeking Alpha article, it uses just three funds and rebalances every 2 weeks.  The article discusses UPRO, but I used TQQQ instead because I expect the recent outperformance of the underlying index to continue in the future.  Even with the recent craziness, its worst drawdown is 26%.

Due to the 3x leverage, it's not for the faint of heart.