Backtest both sides of every 52-week low and see which side has the edge before you commit.
Backtest both sides of every all-time high and see whether breakouts run or exhaust before you take the trade.
Backtest what happens when you short a stock as soon as it closes below a moving average
Backtest what happens when you buy a stock as soon as it closes above a moving average
Short any ticker when it makes a Death Cross and test what happens next
Buy any ticker when it makes a Golden Cross and test what happens next
Backtest which weekday produces the best intraday long returns
Backtest a mean-reversion strategy on any stock that stretches above or below its moving average
Backtest which weekday's overnight session produces the best long returns
Backtest buying a stock when its daily volume spikes above normal