An intraday trade zone on EURUSD using standard deviation

This is the problem when trying to scalp in low volatility. It feels like the market only moves in one direction then stops. I've done a lot of backtests in Metatrader with this strategy and the results suggest problems trading in low and high volatility markets. The most optimal conditions are above 20% historic volatility percentile and less than 80%. I wish I had access to implied volatility in Metatrader as it is much more forward looking than historic, but I don't. I think for now, I will sit out the currency markets until volatility pops up a bit. Hopefully, more days like today will wake up the market.
current HV percentile:
EUR: 5.95%
AUD: 7.94%
GBP: 21.03% YAY!
CAD 80% woah!, that doesn't seem right